Commercial HVAC Milwaukee, WI | Burkhardt Heating, Cooling, Plumbing & Electric

Commercial HVAC is a different discipline than residential work. The equipment is larger, the operating demands are more relentless, and the stakes when something fails are measured not just in discomfort but in production downtime, lost revenue, health code violations, and tenant departures. A restaurant that loses cooling on a Saturday night in July doesn't lose comfort — it loses a service. A manufacturing facility in the Menomonee Valley that loses heat in February doesn't inconvenience employees — it may have to shut the floor.

Milwaukee's commercial property landscape makes this even more complex. The metro mixes pre-war brick office buildings in Walker's Point and downtown corridors with postwar industrial strips along the Menomonee and Kinnickinnic corridors, 1970s and 80s retail along Capitol Drive and Layton Avenue, newer professional office parks in Brookfield and Mequon, and everything in between. That diversity of building vintage means an equally diverse mix of mechanical systems: aging rooftop units running well past their intended service life, boiler-fed hydronic heat in older commercial buildings, modern VRF systems in newly renovated office space, and makeshift equipment arrangements in tenant build-outs that have been modified by multiple contractors over the decades.

Burkhardt Heating, Cooling, Plumbing & Electric has been serving the Milwaukee commercial market for more than 40 years. Our technicians are licensed for commercial HVAC work in Wisconsin, our trucks carry the equipment and refrigerants commercial jobs demand, and we operate with 24/7 emergency dispatch because we understand that commercial failures don't schedule themselves for business hours.

Call us at (414) 355-5520 — any time, for any commercial HVAC need.

Why Commercial HVAC Is Different From Residential

The gap between residential and commercial HVAC isn't just one of scale. It's a difference in system design philosophy, regulatory complexity, operating requirements, and failure consequence.

Operating Hours and Load Profiles

A home heating system runs for a few hours a day during peak season. Commercial HVAC equipment in an office building may operate 10 to 12 hours a day, five or more days per week. A 24-hour manufacturing or distribution facility never gives the equipment a rest at all. That continuous demand changes wear rates, maintenance intervals, and the economic calculus around replacement. Equipment that might last 18 years in a residential application often has a shortened service life in a high-utilization commercial environment.

Multi-Zone Complexity

Most commercial buildings require independently controlled zones — different floors, different tenant spaces, server rooms, kitchen areas, executive suites, lobbies. Each zone has different occupancy patterns, equipment loads, and temperature requirements. Managing that complexity requires controls beyond a simple residential thermostat: zone dampers, variable air volume (VAV) boxes, building automation systems (BAS), and in modern buildings, full direct digital control (DDC) systems that coordinate hundreds of individual data points.

Equipment Scale and Refrigerant Licensing

A residential split system runs two to five tons of cooling capacity. A commercial rooftop unit handling a 10,000-square-foot retail space might be 10 to 20 tons. A mid-rise office building might require 200 tons of total cooling across multiple systems. Larger refrigerant circuits require EPA Section 608 Universal certification for refrigerant handling — a credential beyond the standard technician license. Wisconsin also has its own DNR requirements for refrigerant management and disposal on commercial systems.

Code Compliance and Permitting

Commercial HVAC in Wisconsin operates under Wisconsin SPS 364 (the HVAC code), with additional requirements under ASHRAE 62.1 for ventilation, ASHRAE 90.1 for energy efficiency, and Milwaukee city-specific commercial mechanical permit requirements. For buildings that serve food, the Wisconsin Department of Agriculture, Trade and Consumer Protection (DATCP) imposes additional requirements on makeup air and ventilation. The permit and inspection requirements for commercial work are substantially more demanding than residential, and they matter: non-permitted installations create liability for building owners at the time of sale, lease-up, or insurance claims.

Business Interruption Stakes

When a home furnace fails, a family is uncomfortable. When the HVAC fails in a commercial building, the consequences scale with the business type. A manufacturer loses production and may miss delivery commitments. A restaurant faces health code implications if kitchen temperatures or refrigeration systems are compromised. A multi-tenant office building faces tenant complaints and potential lease defaults. A medical practice may have to cancel procedures. The cost of HVAC failure in commercial settings is almost always greater than the cost of the repair — which is why preventive maintenance and fast emergency response matter so much.

Commercial Property Types We Service

Burkhardt services commercial properties of all types across the Milwaukee metro. Each property category has distinct mechanical challenges — here's how we approach the most common ones.

Office Buildings (1,000–50,000 Sq Ft)

Light commercial office space — professional suites, multi-tenant office buildings, standalone professional practices — is the backbone of the suburban Milwaukee commercial market. Brookfield, Mequon, Wauwatosa, and the western suburbs are dense with this property type. The mechanical challenges in offices center on zoning (different tenants, different schedules), equipment that was designed for the original tenant mix and then never updated, and the energy efficiency gap between aging RTUs and modern systems. We handle everything from single-zone split systems in small professional suites to multi-RTU rooftop systems serving larger office buildings.

Retail and Strip Mall Storefronts

Milwaukee's retail strips — Capitol Drive, Layton Avenue, Greenfield Avenue, Bluemound Road, the suburban town centers in Waukesha and Germantown — are full of commercial spaces where the HVAC system is driven hard by high occupancy, frequent door cycles, and cooking or food prep equipment in some bays. Rooftop units dominate this segment. Tenant turnover means the equipment gets modified, replaced, or supplemented by multiple contractors over the years, leaving building owners with inconsistent systems and maintenance histories. Burkhardt works with building owners and property managers to assess, consolidate, and maintain retail mechanical systems.

Restaurants and Food Service

Restaurants are mechanically demanding in ways most property types aren't. Kitchen exhaust systems must be properly sized and balanced against makeup air units (MUAs) to maintain building pressure, comply with Wisconsin code, and prevent grease migration into ductwork and rooftop equipment. Wisconsin's SPS 364 and local health department requirements govern commercial kitchen ventilation specifically. We install and service commercial kitchen exhaust and makeup air systems, coordinate with refrigeration specialists when needed, and handle the HVAC work in restaurant build-outs and renovations.

Light Manufacturing and Warehouse

The Menomonee Valley, Kinnickinnic corridor, and industrial parks in Oak Creek, West Allis, and Germantown are home to the light manufacturing and distribution operations that define Milwaukee's industrial base. These facilities often have HVAC equipment that was installed for a different purpose than the current use, spot cooling challenges from machinery that generates significant heat loads, and large unconditioned warehouse sections adjacent to conditioned office and production areas. We size and install unit heaters, makeup air systems, rooftop equipment, and split systems for manufacturing environments, and we understand the operational constraints that come with scheduling work around production.

Medical and Dental Practices

Medical and dental spaces require HVAC precision that exceeds general commercial standards. Procedure rooms, sterilization areas, and patient care spaces often require tight temperature and humidity control — ASHRAE 170 (healthcare facilities) establishes specific ranges for many clinical environments. Outdoor air requirements are higher than general commercial to manage pathogen dilution. We work with medical office build-outs and existing practice facilities to ensure the mechanical systems meet clinical requirements, not just tenant comfort standards.

Multi-Tenant Residential (Apartment Buildings and Condo Associations)

Milwaukee has a large stock of multi-unit residential buildings — from vintage walk-up apartments on the East Side and Riverwest to mid-rise condominiums and new construction apartment complexes. Central plant systems serving multiple units, corridor heating and cooling systems, and lobby and common area HVAC all fall under commercial HVAC licensing and equipment categories. We service and install central boiler and chiller plants, fan coil systems, through-wall packaged terminal equipment (PTACs), and corridor/common area systems in multi-unit residential buildings.

Schools, Daycares, and Churches

Educational and religious facilities have unique HVAC demands: extremely variable occupancy patterns (packed for services or school days, empty for long stretches), buildings that often mix vintage construction with more recent additions, and tight budget constraints on capital replacement. Indoor air quality matters more in these environments, not less — ASHRAE 62.1 ventilation requirements for classrooms and gathering spaces are more demanding per person than general commercial. We work with school districts, independent schools, daycares, and churches throughout the Milwaukee area on both maintenance and capital replacement projects.

Auto Dealerships, Gyms, and Fitness Centers

High-ceiling showrooms, service bays with vehicle exhaust, retail areas, and customer lounges in auto dealerships all require different mechanical approaches in a single building. Fitness centers and gyms deal with extreme latent heat loads from human occupancy and high fresh air requirements to manage odors and CO2. We design and service HVAC systems for these specialty commercial property types with the specific load calculations their environments demand.

Commercial HVAC Equipment We Install and Service

Rooftop Units (RTUs)

Rooftop packaged units are the workhorse of Milwaukee's commercial HVAC market. Walk any commercial strip or suburban office park and you'll see them stacked on rooftops — single-zone and multi-zone units ranging from 3 tons to 25 tons per unit. RTUs combine the air handler, refrigeration circuit, and often the heating system (gas furnace section or electric heat strips) in a single package mounted on the roof curb, which simplifies mechanical room requirements and separates the refrigerant circuit from occupied space. The tradeoff is weather exposure and the physical demands of rooftop access for maintenance.

We service and replace RTUs from all major manufacturers. Typical RTU service life is 12 to 20 years; with consistent planned maintenance, units regularly reach 18 to 25 years. The RTU replacement cycle in Milwaukee's commercial stock is ongoing — a substantial number of units installed in the 1990s and 2000s commercial construction booms are either at or past their service life now.

Light Commercial Split Systems (2–20 Tons)

Split systems — with the condensing unit at grade or on equipment pads and the air handler inside — serve light commercial and professional office applications where rooftop installation isn't practical or where the building mechanical room has space for the air handler. Light commercial split systems from 2 to 20 tons serve small to mid-size professional suites, medical practices, and smaller retail spaces throughout the metro.

Package Units (Gas/Electric)

Packaged units serve both ground-level applications (where units sit on concrete pads adjacent to the building) and rooftop installations. Gas-electric packaged units — gas furnace for heating, electric DX cooling — are the most common commercial package configuration. We install and service packaged units for all commercial applications.

VRF/VRV Systems (Variable Refrigerant Flow)

Variable refrigerant flow systems represent the most significant efficiency advancement in commercial HVAC of the past 20 years. A VRF system uses one large outdoor condensing unit connected to multiple indoor fan coil units — serving dozens of zones simultaneously with individual control — by varying refrigerant flow through electronically controlled expansion valves rather than using centralized air distribution ductwork. The advantages are substantial: simultaneous heating and cooling in different zones (heat recovery VRF), precise zoning, 40 to 50 percent energy savings versus older RTU-based systems, and a dramatically reduced footprint in the mechanical infrastructure.

VRF systems are increasingly common in Milwaukee's renovated office buildings and new construction commercial space. The systems require factory training to install and service correctly — we carry Mitsubishi Electric commercial VRF certification and service LG Multi V and Daikin VRV systems as well.

Commercial Boiler and Hydronic Systems

Older Milwaukee commercial buildings — brick office blocks downtown, pre-war industrial buildings repurposed as offices and breweries, churches, schools — commonly rely on commercial boiler systems for heating. These range from atmospheric and forced draft gas boilers feeding hot water hydronic systems to steam boilers serving large vintage buildings. Commercial hydronic systems with chillers for cooling are also present in mid-rise office and medical buildings.

For properties with commercial boiler systems, see our dedicated commercial boiler and steam system page for depth on service, repair, and replacement options specific to hydronic heating.

Makeup Air Units (MUAs)

Commercial kitchens, certain manufacturing processes, and other environments with large exhaust volumes require makeup air units to replace the air being exhausted and maintain building pressure. Wisconsin SPS 364 requires properly designed and balanced exhaust/makeup air systems for commercial kitchen applications. An undersized or absent MUA system creates negative pressure in the building — causing back-drafting, cold drafts at entrances, and potential carbon monoxide issues from combustion appliances. We design, install, and service makeup air units for restaurants, food processing, and other applications requiring large exhaust volumes.

Computer Room Air Conditioning (CRAC Units)

Server rooms and telecommunications equipment rooms generate extreme sensible heat loads in a small footprint and cannot tolerate temperature excursions. Computer room air conditioning units provide precision cooling with humidity control designed specifically for the thermal profiles of electronic equipment. We install and service CRAC units for equipment rooms in office buildings, medical practices, and small data center applications.

Chillers and Hydronic Cooling Systems

Larger commercial buildings — mid-rise office buildings, medical campuses, schools — often use central chiller plants that distribute chilled water to air handlers throughout the building rather than using multiple distributed refrigeration circuits. Chiller-based systems offer efficiency at scale and centralized refrigerant containment. We service and support chiller-based hydronic cooling systems as part of comprehensive commercial HVAC service contracts.

Commercial HVAC Services We Provide

Emergency Repair — 24/7 Dispatch

Commercial equipment failures don't wait for business hours, and Burkhardt doesn't either. We operate 24/7 emergency dispatch for commercial customers, with real dispatchers answering calls after hours — not an answering service queuing a callback for morning. For service contract customers, emergency calls receive priority dispatch. Typical response time for commercial emergencies is one to four hours. Our trucks carry the most common commercial refrigerants (R-410A, R-32, R-22 for legacy service), replacement contactors, capacitors, motors, and control components to maximize the likelihood of a same-trip repair rather than a diagnosis-only call.

Planned Maintenance Contracts

Scheduled preventive maintenance is the single most effective way to reduce emergency calls, extend equipment life, and maintain the documentation trail that insurance carriers and equipment warranties require. Our commercial PM programs are tailored to the property type, equipment inventory, and operating schedule — not a one-size residential template applied to a commercial situation.

Equipment Replacement and Retrofit

When equipment has reached the end of its service life or when efficiency considerations drive a capital replacement decision, Burkhardt manages the full replacement process: load calculation and equipment specification, permit application, equipment procurement, installation, startup, and commissioning. We coordinate with building managers and general contractors on tenant build-out projects and can sequence work around occupied building constraints.

New Installation for Tenant Build-Outs

Tenant build-outs in existing commercial buildings — new medical practices, restaurant conversions, office fit-ups — require new HVAC systems or extensions of the base building system. We work with general contractors and commercial real estate firms throughout the Milwaukee metro on build-out projects, pulling the required commercial mechanical permits and coordinating with electrical and plumbing (both of which we can self-perform) to avoid the scheduling friction of multiple subcontractors.

Code Compliance Upgrades

Buildings that have had HVAC systems modified, expanded, or altered without permits — common in Milwaukee's older commercial stock — can face compliance issues at the time of sale, refinancing, or lease renewal. We assess existing systems against Wisconsin SPS 364 and ASHRAE 62.1 requirements, identify deficiencies, and develop scopes of work to bring systems into compliance. We pull the permits and deliver the inspection documentation property owners need.

Energy Audits and Efficiency Upgrades

Commercial buildings with aging HVAC equipment are often running at a fraction of their potential efficiency. An energy audit identifies the specific measures — equipment replacement, controls upgrades, variable frequency drive (VFD) additions, economizer repair or replacement — that will deliver the highest return on investment. As a Wisconsin Focus on Energy registered contractor, we can apply rebates that partially offset upgrade costs.

Indoor Air Quality Assessment

Post-pandemic, indoor air quality has moved from a background concern to an active facility management priority. ASHRAE 62.1 ventilation requirements, filtration upgrades (MERV 13 or better for most commercial applications), UV-C air treatment for healthcare, and CO2 monitoring for demand-controlled ventilation are all elements of a comprehensive commercial IAQ approach. We assess existing ventilation systems against current standards and implement upgrades appropriate to the occupancy type.

Why Preventive Maintenance Matters for Commercial Properties

The cost calculation for commercial HVAC maintenance is fundamentally different from residential. It's not about personal comfort — it's about operational continuity and asset protection.

Manufacturing and Production Facilities: A single day of production downtime caused by an HVAC failure in a Milwaukee manufacturing plant can cost more than a year of maintenance contracts. Temperature excursions affect not just comfort but product quality in some manufacturing processes, and equipment that requires specific temperature ranges to operate may shut down before the people in the building are even uncomfortable.

Retail: A retail space with no cooling on a hot August weekend loses customer traffic immediately. Customers don't return the next day when the system is repaired — they establish a pattern with a competitor. The revenue lost to a single failed cooling season is rarely recovered in the same fiscal year.

Restaurants: Commercial kitchen environments place extreme demands on HVAC equipment — high heat loads, grease-laden air, and continuous operation. Health code violations related to kitchen temperature, ventilation, or exhaust system function can trigger temporary closure. Restaurant margins are too thin to absorb that kind of disruption.

Multi-Tenant Buildings: Tenant retention in commercial real estate depends partly on the reliability of building systems. HVAC complaints are among the most common causes of lease non-renewal. A property manager who can demonstrate a documented maintenance program has a concrete answer when tenant comfort issues arise.

Warranty and Insurance: Most commercial HVAC equipment manufacturers require documented annual maintenance to preserve warranty coverage. Some commercial property insurance carriers ask for maintenance records as part of claim investigations. A signed PM contract with service documentation is evidence that due diligence was performed.

Equipment Lifespan: A commercial RTU without maintenance might last 10 to 14 years. The same unit under a consistent PM program routinely reaches 18 to 25 years. On a $15,000 to $25,000 per-unit replacement cost, extending the service life by five to seven years has meaningful economic value.

Commercial HVAC Service Contracts

Burkhardt's commercial preventive maintenance contracts are structured around the specific equipment, property type, and operational requirements of each customer — not a generic form agreement.

Service Frequency Options

Quarterly PM: Appropriate for high-utilization facilities — restaurants, manufacturing, medical practices, buildings with complex multi-system inventories. Quarterly service allows filter changes, coil inspection, and control checks on a schedule that matches commercial equipment wear rates.

Semi-Annual PM: Standard for most commercial office and retail applications. Spring and fall service visits — one ahead of the cooling season, one ahead of the heating season — align service with the operational demands of Milwaukee's climate.

Annual PM: Appropriate for lower-utilization facilities or smaller single-system properties with newer equipment.

What's Included in a Commercial PM Visit

A commercial PM visit from Burkhardt includes:

Filter replacement (disposable) or cleaning (permanent media)
Evaporator and condenser coil inspection and cleaning as needed
Belt and pulley inspection on belt-drive systems
Refrigerant pressure check and subcooling/superheat verification
Electrical connections: tighten, inspect for corrosion and heat damage
Contactor and capacitor condition check
Drain pan cleaning and condensate drain inspection
Economizer damper operation check (stuck economizers waste significant energy)
Control calibration — thermostat, aquastat, or BAS setpoint verification
Combustion analysis on gas-fired heating equipment
Documentation: written service report for each visit, maintained in your property file

Service Contract Benefits

24/7 priority emergency dispatch for contract customers
Discounted labor rate on repair calls during the contract period
Written service documentation for warranty, insurance, and compliance purposes
Advance notice on equipment nearing end of service life — no surprise capital calls
Coordination with building managers and property management companies

Energy Efficiency Upgrades for Commercial Properties

Commercial energy efficiency upgrades in Wisconsin have never been more financially accessible. Between Wisconsin Focus on Energy commercial rebates, federal tax incentives, and the operational savings from modern equipment, the payback period on strategic upgrades has shortened considerably.

Wisconsin Focus on Energy Commercial Rebates

Focus on Energy offers commercial rebates ranging from approximately $500 to $15,000 or more depending on equipment type, efficiency level, and project scale. High-efficiency rooftop unit replacement, VRF system installation, variable frequency drive additions to existing motors, and controls upgrades all qualify for commercial rebate consideration. Burkhardt is a registered Focus on Energy contractor — we identify qualifying measures, specify compliant equipment, and submit rebate documentation on your behalf.

VRF Retrofits

Replacing aging multi-RTU rooftop systems with a VRF architecture can reduce HVAC energy consumption by 40 to 50 percent in commercial office and medical applications. The upside is substantial in Milwaukee's climate, where heating and cooling demands are both significant. VRF heat recovery systems can simultaneously heat interior zones (which tend to be cooling-dominated year-round due to occupant and equipment loads) while heating perimeter zones — a capability that reduces both heating and cooling energy demand simultaneously.

Variable Frequency Drives (VFDs) on Existing Equipment

Adding VFDs to HVAC fan motors and pump motors on existing systems — without replacing the equipment itself — is often the highest-ROI single measure available. A VFD that reduces motor speed by 20 percent reduces energy consumption by approximately 50 percent (due to the cube law relationship between motor speed and power consumption). For commercial buildings with large supply fans, exhaust fans, or hydronic pump motors, VFD retrofits frequently pay back in two to four years.

DDC Controls and Smart Building Integration

Commercial buildings with aging pneumatic or older digital controls are operating with significant energy waste from control drift, failed actuators, and setpoint schedules that no longer match occupancy patterns. Upgrading to modern direct digital control (DDC) systems with occupancy-based scheduling, outdoor air reset, demand-controlled ventilation, and remote monitoring provides both energy savings and the operational visibility that sophisticated building owners and property managers want.

Federal 179D Commercial Energy Tax Deduction

The Section 179D commercial building energy efficiency tax deduction allows commercial building owners to deduct up to $5 per square foot for qualifying HVAC, lighting, and building envelope improvements that achieve specified energy savings relative to ASHRAE 90.1 baselines. The deduction was expanded under the Inflation Reduction Act. On a 10,000-square-foot commercial building, a qualifying retrofit can generate a $50,000 tax deduction — a significant offset to the capital investment. Consult your tax advisor for guidance specific to your situation; Burkhardt can provide the energy certification documentation the deduction requires.

Wisconsin Code Compliance for Commercial HVAC

Wisconsin SPS 364

Wisconsin SPS 364 is the primary HVAC code for commercial buildings in the state. It governs equipment installation standards, ductwork requirements, ventilation rates, combustion air provisions, and equipment clearances. Commercial HVAC installations and major modifications require permits issued by the local authority having jurisdiction — in Milwaukee, that's the Department of Neighborhood Services (DNS). SPS 364 was updated to align more closely with the 2021 International Mechanical Code, raising the baseline for a number of commercial ventilation requirements.

ASHRAE 62.1 Ventilation Requirements

ASHRAE 62.1 establishes minimum outdoor air ventilation rates for commercial occupancies — measured in cubic feet per minute per person and per square foot of floor area, varying by occupancy type. Medical, educational, and assembly occupancies have higher per-person ventilation requirements than general office space. Buildings where HVAC systems have been modified without recalculating ventilation compliance may be delivering inadequate outdoor air — a condition that has both health and liability implications.

Wisconsin DSPS Permitting

The Wisconsin Department of Safety and Professional Services (DSPS) oversees licensing for HVAC contractors and technicians in the state. Commercial HVAC work requires contractor and technician licensing under Wisconsin Chapter HVAC 200. All Burkhardt technicians performing commercial HVAC work carry the required Wisconsin credentials. Unlicensed commercial HVAC work is both illegal and a liability risk for building owners.

DNR Refrigerant Management

Wisconsin DNR regulations track commercial refrigerant use in the context of the EPA Section 608 framework and state-level air quality requirements. The phase-down of R-22 (completed) and the ongoing R-410A phase-down under the AIM Act are creating compliance and supply considerations for commercial buildings with older equipment. Next-generation lower-GWP refrigerants — R-32 and the A2L category (mildly flammable) — are entering the commercial market with their own handling and installation requirements. Burkhardt stays current on refrigerant transition requirements and maintains the certifications required to handle all commercial refrigerant types.

Milwaukee Commercial Mechanical Permits

The City of Milwaukee requires commercial mechanical permits for HVAC installation, replacement, and major modification work. Permits are pulled through the Department of Neighborhood Services; inspections are scheduled through the same department. Permit fees vary by project scope. Burkhardt manages the permit application process on every commercial project — building owners should be skeptical of any contractor who proposes to skip permitting on commercial work.

Common Commercial HVAC Problems We Diagnose and Fix

Insufficient Cooling in Multi-Zone Systems

The most common complaint in commercial buildings — "it's hot in our suite" or "the third floor never gets cool" — usually traces to one of three causes: zoning system failure (dampers stuck closed, zone control board failures), undersized equipment for the current occupancy and load, or refrigerant circuit problems on the RTU serving that zone. We diagnose multi-zone systems with system-level thinking rather than starting with equipment replacement — often the problem is in the controls and ductwork, not the RTU itself.

Premature Compressor Failure

Commercial compressors failing before the end of their expected service life almost always reflect a root cause: refrigerant charge problems (both overcharge and undercharge stress compressors), short cycling from oversized equipment or thermostat hunting, inadequate liquid line filtration, or poor-quality refrigerant oil circulation. Replacing a compressor without diagnosing and correcting the root cause produces another failed compressor on the same schedule. We address root cause, not just the failed component.

Refrigerant Leaks

Refrigerant leaks in commercial systems manifest as oil staining at fittings and valve stems, ice formation on suction lines, compressor overheating, and reduced cooling capacity. Large commercial systems with refrigerant in extended piping runs are more prone to leak development than compact residential equipment. We locate leaks using electronic and UV-dye methods, repair at the source, pressure-test, and recharge with the correct refrigerant and charge — with documentation required for EPA and DNR compliance.

Frozen Evaporator Coils

Ice on the evaporator coil in a commercial air handler indicates either inadequate airflow (dirty filters, failed fan motor, restricted ductwork) or a refrigerant charge issue. Commercial evaporator coils that freeze repeatedly cause water damage to drain pans, air handlers, and in rooftop configurations, the roof membrane. We identify and correct the underlying cause rather than just defrosting the coil.

Hot Spots in Office Buildings

Isolated hot zones in office buildings — a conference room that's always warm, an interior office with no cooling — frequently result from zoning damper failures, undersized diffuser sizing for renovation changes, or thermostat sensor placement problems. Modern open-plan office conversions often inherit ductwork designed for the original private office layout, creating distribution imbalances. We assess zone-level airflow and make targeted corrections.

Humidity Problems

Oversized commercial air conditioning equipment — sized for peak load without accounting for part-load operating conditions — will cool the space to setpoint quickly but won't run long enough to dehumidify adequately. The result is a space that's at temperature setpoint but feels clammy, and one that may experience condensation on surfaces and elevated mold risk. Corrections range from controls adjustments (extended cooling cycles) to standalone dehumidification equipment to equipment right-sizing on replacement.

Failing Economizers

Commercial rooftop units are required by Wisconsin energy code to include economizers — damper systems that bring in free outdoor air for cooling when outdoor conditions allow, reducing mechanical cooling energy. When economizer dampers stick in the open position during winter, they introduce massive quantities of cold outdoor air, creating both heating cost spikes and comfort complaints. When stuck closed in summer, they waste energy on mechanical cooling that could be handled with outdoor air. Economizer service is a specific maintenance item that's often neglected — and it has outsized energy cost implications when it fails.

Frequent Breaker Trips on AC Units

A commercial AC unit that repeatedly trips its circuit breaker is drawing excess current — caused by a failed capacitor, a failing compressor drawing locked-rotor current, dirty condenser coils causing high head pressure, or a direct electrical fault. Repeated breaker trips can damage the compressor irreparably if the root cause isn't identified quickly. This is an emergency service situation, not a "reset and watch" situation.

Emergency Commercial Service and Response Time

Burkhardt operates 24/7 commercial emergency dispatch — not an answering service, but a live dispatcher who can reach an on-call technician immediately. For established service contract customers, emergency calls receive first priority over non-contract calls.

Typical response time for commercial emergencies in the Milwaukee metro is one to four hours from initial call to technician on-site, depending on location and time of day. Our service trucks carry a commercial-grade parts inventory: common contactors, capacitors, fan motors, control boards, refrigerants (R-410A, R-32, and R-22 for legacy equipment service), and hand tools for most commercial RTU and split system configurations. Same-day diagnosis is achievable on most calls; same-trip repair is achievable on the majority of common failure modes.

Commercial customers with service contracts can also reach their assigned service team directly for non-emergency scheduling — no hunting through a general phone queue for routine calls.

Commercial HVAC Cost Ranges

These ranges reflect typical Milwaukee-area commercial pricing. Actual project costs vary significantly based on equipment type, building access, system complexity, and permit requirements. We provide written upfront pricing before any work begins.

Diagnostic service call: $250–$450 for most commercial diagnostic visits, including travel and initial assessment. For complex systems or remote sites, expect the upper end of that range.

Planned maintenance contracts: $500–$3,500 per year, depending on equipment quantity, system complexity, and service frequency. A small professional office with a single RTU is toward the lower end; a multi-RTU retail building with rooftop access requirements is toward the upper end.

Commercial RTU replacement (5–10 ton range): $8,000–$25,000 per unit installed, including equipment, curb adapter if needed, refrigerant, electrical connections, controls, and permit. Larger units (15–25 ton) run higher. Focus on Energy rebates can offset a portion of qualifying replacements.

VRF system retrofit: $40,000–$300,000+ depending on building size, number of zones, refrigerant piping complexity, and electrical service requirements. These are capital projects that require detailed engineering and permitting — we provide project-level scoping and pricing, not ballpark estimates.

Commercial financing: GreenSky commercial financing is available for qualifying equipment replacement and retrofit projects, including deferred interest and fixed-payment options.

Commercial Brands We Service and Install

Our technicians are trained, certified, and equipped to service commercial equipment from the major manufacturers in the Milwaukee market:

If your building has equipment from a manufacturer not listed here, call us — our commercial technicians service a broad range of equipment and can source parts through commercial supply channels.

Commercial HVAC Service Coverage Area

Burkhardt services commercial properties throughout Milwaukee and the surrounding metro:

For commercial AC installation in the Milwaukee area, our commercial team handles equipment specification, permitting, and installation. For properties with commercial furnace or forced-air heating needs, see our commercial furnace installation and service page. Properties with commercial boilers should review our dedicated commercial boiler and hydronic systems resource.

Not sure whether your property falls within our service territory? Call (414) 355-5520 — we'll confirm coverage immediately.

Why Choose Burkhardt for Commercial HVAC

40+ Years in the Milwaukee Commercial Market Burkhardt has been servicing commercial properties in the Milwaukee metro since the early 1980s. We've worked in essentially every commercial property type in the market — office buildings, restaurants, manufacturing, schools, medical practices, religious institutions, multi-unit residential. That accumulated experience means our commercial technicians recognize system configurations and failure patterns that a less experienced contractor would spend time diagnosing.

Wisconsin-Licensed Commercial HVAC Technicians Every Burkhardt technician performing commercial HVAC work holds the required Wisconsin credentials under Chapter HVAC 200. Our commercial team includes technicians with Class A and Class B licenses, EPA Section 608 Universal certification, and factory training on major commercial equipment platforms including Mitsubishi Electric VRF systems. Licensing matters for permit compliance, warranty preservation, and your liability as a building owner.

Plumbing and Electrical Under One Roof Most commercial HVAC contractors subcontract plumbing and electrical work to separate trades. Burkhardt is licensed for commercial HVAC, plumbing, and electrical — meaning tenant build-outs, system retrofits, and complex commercial projects don't require coordination across three separate subcontractors. One schedule. One contract. One point of accountability. For commercial property managers and general contractors, this is a meaningful operational advantage.

24/7 Emergency Dispatch Live dispatch after hours, priority response for contract customers, one-to-four-hour response target across the Milwaukee metro.

Wisconsin Focus on Energy Registered Contractor We manage the rebate process — identifying qualifying equipment, ensuring compliance, and submitting applications. Building owners don't need to navigate the Focus on Energy commercial program independently.

Service Contracts with Documentation Every PM visit generates a written service report. Your property file accumulates documentation that demonstrates due diligence to insurers, tenants, equipment warranty administrators, and future buyers.

Family-Owned, Locally Rooted Burkhardt is a Milwaukee family business. We're not a national franchise or a private-equity roll-up — we're a company that's operated in this market for four decades and intends to be here for four more. Our reputation in the Milwaukee commercial market is built visit by visit.

Frequently Asked Questions — Commercial HVAC in Milwaukee

Do you handle large commercial RTU replacements? Yes. We replace commercial rooftop units in the 5- to 25-ton range routinely, and we work with commercial equipment distributors for larger units. We pull the required commercial mechanical permits, coordinate curb and structural requirements with the building owner or roofing contractor, and handle startup and commissioning. For buildings with multiple RTUs, we can phase replacement to minimize operational disruption.

What is your response time for commercial emergencies? For service contract customers, emergency calls receive priority dispatch — typically one to four hours to on-site response in the Milwaukee metro. Non-contract commercial customers receive emergency service as well, though response priority follows contract customers. Call (414) 355-5520 any time, day or night.

Do you offer commercial service contracts? Yes. Our commercial PM contracts are tailored to your specific equipment inventory and operational requirements — quarterly, semi-annual, or annual frequency depending on property type and equipment age. Contracts include 24/7 priority emergency dispatch, discounted repair labor, and written service documentation.

Can you handle VRF and VRV systems? Yes. Our technicians are Mitsubishi Electric commercial VRF certified and service LG Multi V and Daikin VRV systems. VRF systems require manufacturer-specific training that not all commercial HVAC contractors carry — particularly for refrigerant circuit troubleshooting, inverter board diagnostics, and system commissioning.

Do you perform commercial tenant build-outs? Yes. We work with general contractors and commercial real estate firms throughout the Milwaukee metro on tenant build-out projects — new HVAC systems, extensions of base building systems, kitchen exhaust and makeup air for restaurant conversions, and specialized systems for medical and technical spaces. We pull the commercial mechanical permits and can self-perform the HVAC, plumbing, and electrical portions of a build-out under a single subcontract.

What about commercial boilers and steam systems? Yes. Older Milwaukee commercial buildings with boiler-based heating are a significant part of our service territory. We repair and replace commercial hydronic and steam boilers, service commercial boiler rooms, and manage the transition from steam to hot water systems when that conversion makes economic sense. See our commercial boiler and hydronic systems page for detailed information.

Will you coordinate with my building manager or property management company? Yes — and this is typical for most of our commercial accounts. We work directly with on-site building managers, third-party property management firms, and building owners who may not be on-site. Service visit scheduling, access coordination, and post-visit reporting can be directed to whoever manages day-to-day building operations.

Do you handle commercial refrigeration? We service walk-in coolers and freezers, reach-in refrigeration equipment, and the HVAC systems in commercial kitchen environments. We do not service full commercial refrigeration lines — cases, prep tables, ice machines at scale — that fall under the commercial refrigeration specialty trades. For commercial kitchen HVAC and exhaust, we are your contractor; for large-scale commercial refrigeration equipment, we can recommend qualified refrigeration specialists in the Milwaukee market.

Get a Commercial HVAC Assessment or Emergency Service

Commercial HVAC problems don't resolve on their own, and deferred maintenance on aging equipment rarely saves money over time — it transfers costs from planned maintenance to unplanned emergency repair, often with production or revenue downtime attached.

Whether you're managing a building with HVAC systems that haven't been on a maintenance program, planning a tenant build-out that needs mechanical coordination, facing an emergency right now, or looking to understand your options for aging RTU replacement — Burkhardt is equipped to help.

Call (414) 355-5520 to speak with our commercial service team directly. We answer 24 hours a day, seven days a week. A site assessment can typically be scheduled within one to three business days; emergency service is available immediately.

Licensed commercial HVAC contractors. Milwaukee-based. Available now.

Need Help? Call Burkhardt.

Call Us At: (414) 206-3049

Discover why so many homeowners trust Burkhardt with ALL of their Home Heating needs!

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Commercial HVAC in Milwaukee, WI — Repair, Install, Maintenance