Furnace Repair in Sussex, WI

Sussex grew from a small Waukesha County village into one of the Milwaukee metro's fastest-growing communities during the 1990s and 2000s — and its furnace service profile reflects that concentrated era of construction. The subdivisions that spread along N. Pine Lake Road and Pewaukee Road during Sussex's sewer-expansion growth period were built with modern two-stage and early modulating furnaces, communicating thermostats, and high-efficiency 90-plus equipment. Those systems are now 15 to 25 years old.

The failure modes we see most often in Sussex are consistent with late-1990s and early-2000s equipment: inducer motor bearing wear (these motors run nearly every time the furnace fires, accumulating thousands of hours of use over two decades), heat exchanger fatigue from years of thermal cycling, pressure switch hose cracking, and control board failures that manifest as intermittent faults. Two-stage furnaces have more components than single-stage equipment, and as they age, the second-stage modulation components often show wear before the primary heating circuit does.

Sussex also has a growing number of custom homes in newer subdivisions featuring variable-speed furnaces and communicating HVAC systems — equipment that requires technicians trained on advanced diagnostics, not just conventional residential furnace knowledge. The Bugline Recreation Trail corridor marks some of the village's more established residential areas, where mid-1990s homes now host furnaces entering their second generation of replacement.

Wisconsin winters in the Lake Country area are cold, and Sussex's open suburban landscape provides less wind protection than more densely built communities. When temperatures drop to -15 degrees Fahrenheit and stay there, your furnace operates at full capacity with zero tolerance for component weakness.

Burkhardt Heating, Cooling, Plumbing & Electric serves all of Sussex and Waukesha County. NATE-certified, all major brands including advanced communicating systems, 24/7 emergency. Call 414-206-3049. GreenSky financing available.

Burkhardt Heating, Cooling, Plumbing & Electric is a third-generation family business that has served the greater Milwaukee area since 1961. Our NATE-certified technicians are trained on the latest heating equipment and diagnostic protocols from all major manufacturers. We offer straightforward pricing, honest repair-versus-replace assessments, and 24/7 emergency availability every day of the year — including the coldest nights of a Wisconsin winter. Call 414-206-3049 to schedule service or request emergency furnace repair.

Thermostat Issues and Diagnostics

A malfunctioning thermostat is one of the most common reasons a furnace stops working. Before assuming the worst, our technicians check thermostat calibration, wiring connections, and battery levels. We repair and install all major thermostat brands including Honeywell, Ecobee, Nest, and Emerson. If your furnace isn't turning on, is short-cycling, or won't reach the set temperature, the problem may be as simple as a thermostat replacement.

We service and install all major heating brands including Lennox, Carrier, Trane, Rheem, Goodman, American Standard, Bryant, York, Amana, Ruud, Coleman, Heil, Payne, and Tempstar. No matter what brand is in your home, our NATE-certified technicians have the training and parts to get it running.

Furnace Repair and Service in Sussex

Burkhardt Heating, Cooling, Plumbing & Electric provides expert furnace repair and service throughout Sussex, WI. Our NATE-certified heating technicians diagnose and repair all makes and models of gas and electric furnaces, delivering reliable results backed by 60+ years of local experience. For sussex furnace repair, installation, or annual maintenance, call Burkhardt at 414-206-3049. GreenSky financing is available for qualifying furnace replacements.

My Sussex home's two-stage furnace only runs on low stage. The high stage doesn't engage when it's really cold. What's wrong?

Second-stage failure on a two-stage furnace often points to a failed second-stage pressure switch, a wiring issue to the second-stage gas valve, or a fault code on the control board preventing second-stage operation. Burkhardt can diagnose and repair two-stage systems from all major manufacturers — call 414-206-3049.

My Sussex furnace has a communicating thermostat system and shows error codes I don't understand. Can Burkhardt interpret those?

Yes. Our NATE-certified technicians are trained on communicating systems from Carrier, Lennox, Trane, Bryant, and others. These systems display fault codes through the thermostat or control board that identify specific component failures. We have the manufacturer training and diagnostic tools to interpret them accurately.

My Sussex furnace is from 2002 and needs an expensive repair. Should I replace it instead?

A furnace over 20 years old is a strong candidate for replacement rather than major repair. Modern 96 AFUE furnaces use significantly less gas than early-2000s equipment, and new equipment comes with manufacturer warranties. Burkhardt can compare repair costs to replacement ROI and help you make the right financial decision. GreenSky financing makes replacement accessible.

Related Services

• All Services in Sussex
• Furnace Installation in Sussex
• Furnace Replacement in Sussex
• Furnace Maintenance in Sussex
• Furnace Tune-Up in Sussex

Learn more about our HVAC services across southeastern Wisconsin.

Also Serving Sussex-Adjacent Communities

Burkhardt also serves the following neighboring communities — same crews, same response times, same local knowledge:

• Lannon — the historic Lannon Stone village adjacent to Sussex (Waukesha County). Same dispatch routing as Sussex.

If your home is in Lannon, call 414-206-3049 just like our Sussex customers do.