Indoor Air Quality FAQs and Expert Recommendations for Milwaukee County Residents

Common Questions About Indoor Air Quality

Indoor air quality has become a top concern for homeowners across Milwaukee County, and for good reason. The EPA estimates that indoor air can be 2 to 5 times more polluted than outdoor air. With Wisconsin winters keeping residents inside for months at a time, understanding what is in your home's air — and how to improve it — is essential for long-term health.

How Do I Know If My Indoor Air Quality Is Poor?

Common indicators include persistent allergy or asthma symptoms, recurring headaches or fatigue, visible dust accumulation on surfaces, musty or stale odors, and condensation on windows. These signs point to elevated particulate levels, humidity issues, or the presence of biological contaminants like mold and bacteria.

The most reliable way to assess indoor air quality is through professional testing, which can measure particulate matter, volatile organic compounds (VOCs), carbon monoxide, humidity levels, and biological contaminants.

What Are the Most Common Indoor Air Pollutants?

• Dust and pet dander: Fine particles that trigger allergies and asthma in sensitive individuals
• Mold spores: Thrive in humid conditions; common in basements, bathrooms, and HVAC systems
• Volatile organic compounds (VOCs): Released by paints, cleaning products, furniture, and building materials
• Carbon monoxide: Produced by combustion appliances; odorless and dangerous at elevated concentrations
• Radon: A naturally occurring radioactive gas that enters from the soil; the second-leading cause of lung cancer in the U.S.
• Bacteria and viruses: Spread through the air, especially in poorly ventilated spaces

What Can I Do to Improve Indoor Air Quality?

• Upgrade air filters: Use MERV 11–13 rated filters in your HVAC system to capture finer particles without restricting airflow
• Install UV air purification: UV lamps inside the air handler neutralize mold, bacteria, and viruses
• Add whole-home humidification or dehumidification: Maintaining indoor humidity between 30–50% reduces mold growth and respiratory irritation
• Ventilate regularly: Energy recovery ventilators (ERVs) or heat recovery ventilators (HRVs) bring in fresh outdoor air while recovering indoor heat
• Schedule duct cleaning: Ductwork accumulates dust, debris, and potentially mold over time; professional cleaning removes these contaminants

How Often Should I Replace My HVAC Filter?

Standard 1-inch filters should be replaced every 1–3 months. Thicker media filters (4–5 inches) typically last 6–12 months. Homes with pets, allergies, or high dust levels should replace on the shorter end of these ranges. Your HVAC technician can recommend the best filter type for your specific system.

Why Wisconsin Winters Create Unique Indoor Air Quality Challenges

Milwaukee County homes are sealed tightly against the cold from roughly November through April. During these months, the same indoor air recirculates repeatedly through the HVAC system without meaningful dilution from fresh outdoor air infiltration. Pollutant concentrations — dust, dander, bacteria, mold spores, VOCs — can accumulate to levels significantly higher than during warmer months when windows are open.

This is compounded by low winter humidity: dry indoor air (often below 30% relative humidity) irritates mucous membranes, reducing the body's natural defenses against airborne pathogens. Dry air also causes static electricity that suspends dust particles longer before they settle. Whole-home humidification — maintaining indoor humidity at 35–45% during winter — directly addresses this problem. Burkhardt installs and services whole-home bypass and fan-powered humidifiers integrated with your HVAC system.

Wisconsin's soil also makes radon a genuine concern in Milwaukee County. Radon enters homes through foundation cracks and soil contact points; basements in Milwaukee County — where many finished living spaces are located — are particularly susceptible. If your home has not been radon-tested, a test kit (available at hardware stores for $20–$30) is a worthwhile investment. Elevated radon levels can be addressed with a sub-slab depressurization system installed by a certified radon mitigator.

Indoor Air Quality Solutions: A Prioritized Approach

Not every Milwaukee homeowner needs every available air quality solution. A practical approach prioritizes the highest-impact interventions first:

1. Carbon monoxide detectors: Non-negotiable for any home with gas appliances, a furnace, boiler, or attached garage. A $25 detector can save lives.
2. Filter upgrades: Moving from a basic fiberglass filter to a MERV 11–13 pleated filter costs $20–$40 per filter change and captures significantly more particulate matter.
3. Humidity control: If your home is consistently below 30% humidity in winter or above 55% in summer, a whole-home humidifier or dehumidifier addresses a broad range of air quality symptoms.
4. UV air purification: The next layer for homes where biological contaminants are a concern — allergy sufferers, families with young children or elderly members, or anyone who noticed increased respiratory symptoms in winter.
5. Ventilation (ERV/HRV): The most comprehensive solution for tight homes, providing continuous controlled fresh air intake. Higher installation cost but addresses the root cause of pollutant accumulation in sealed winter homes.

Frequently Asked Questions About Indoor Air Quality in Milwaukee

How do I test my home's indoor air quality?
For radon, DIY test kits are available at hardware stores. For broader air quality assessment including particulates, VOCs, and biological contaminants, professional testing provides the most comprehensive picture. Burkhardt can arrange professional IAQ testing as part of a home HVAC assessment.

Does running my HVAC fan continuously improve air quality?
Running the fan continuously circulates air through the filter more often, which does improve particulate filtration. However, it also increases energy consumption and can introduce humidity into the ductwork during humid months. A better approach is a high-quality filter changed regularly and UV air purification for biological contaminants.

Can mold in my HVAC system make me sick?
Yes. Mold colonies on evaporator coils or in ductwork release spores every time the system runs. Symptoms can include chronic respiratory irritation, allergy-like symptoms year-round, and in severe cases, more serious respiratory conditions. UV air purification at the coil and professional duct cleaning are the solutions.

What is an HRV and do I need one in Milwaukee?
A Heat Recovery Ventilator (HRV) exhausts stale indoor air while simultaneously bringing in fresh outdoor air, recovering up to 80% of the heat from the outgoing air stream in the process. In tightly sealed Milwaukee homes, an HRV provides controlled ventilation without significant heat loss — particularly valuable during Wisconsin winters.

How much does a whole-home air purification system cost?
UV air purifiers typically cost $500–$1,500 installed. Whole-home HEPA filtration systems range from $700–$2,500. ERV/HRV ventilation systems typically run $1,500–$3,500 installed. All qualify for GreenSky financing through Burkhardt.

Get Expert Indoor Air Quality Help from Burkhardt

Burkhardt Heating, Cooling, Plumbing & Electric offers comprehensive indoor air quality solutions for Milwaukee County residents, including air purification, filtration upgrades, humidity control, and professional testing. Our NATE-certified technicians can evaluate your home and recommend a tailored improvement plan. With 60+ years in the Milwaukee community as a family-owned company, we bring expertise and integrity to every home visit.

Call (414) 355-5520 to schedule an indoor air quality consultation. We are available 24/7, and GreenSky financing is offered on qualifying projects. For broader HVAC and plumbing guidance, see our drain cleaning resource and our emergency plumber guide.