What to Expect During a Professional Furnace Tune-Up

Demystifying the Annual Furnace Tune-Up

Many Milwaukee homeowners schedule annual furnace maintenance knowing it's important, but without a clear understanding of what actually happens during the service visit. Understanding what a thorough tune-up includes helps you evaluate whether the service you're receiving is complete and gives you context for any findings or recommendations the technician presents.

Step-by-Step: What a Professional Tune-Up Covers

• Visual inspection: The technician begins with a visual assessment of the furnace, checking for visible damage, corrosion, abnormal wear, and any obvious issues with connections, wiring, or the flue.
• Filter check and replacement: Filters are inspected; if they haven't been replaced recently, this is addressed at the start of the visit to ensure the rest of the service is performed with proper airflow.
• Burner cleaning and inspection: Gas burner assemblies accumulate dust and debris that impair efficient combustion. Technicians clean burners and verify that each port fires correctly with a consistent, blue flame.
• Heat exchanger inspection: This is one of the most critical safety checks. Technicians inspect the heat exchanger for cracks or damage that could allow combustion gases (including carbon monoxide) to enter the living space. Methods include visual inspection with a light and mirror, combustion analyzer testing, and sometimes a combustion gas test.
• Blower motor inspection: Blower wheels are cleaned of dust buildup that causes imbalance and inefficiency; motor bearings are lubricated if the design requires it; blower belt condition is checked on older systems with belt-drive blowers.
• Electrical connection testing: All electrical connections are inspected for corrosion and tightened; starting capacitors are tested; control board components are visually inspected.
• Flue and venting inspection: The flue pipe and venting connections are checked for proper pitch, secure connections, and absence of obstructions or corrosion.
• System controls test: The thermostat, limit switches, pressure switches, and ignition system are tested for proper operation.
• Combustion analysis: Using a combustion analyzer, technicians measure the efficiency of combustion and verify safe operation — checking CO in flue gas, excess air percentage, and stack temperature.
• Performance measurement: Temperature rise through the heat exchanger is measured and compared to the furnace's rated specifications.

What Happens After the Tune-Up

A thorough technician provides a written summary of the inspection findings, any repairs performed, and recommendations for items that need future attention. Be wary of technicians who recommend replacing multiple expensive components without clear diagnostic evidence — honest service means showing you why a recommendation is necessary.

Schedule Your Furnace Tune-Up with Burkhardt

Burkhardt Heating, Cooling, Plumbing & Electric provides comprehensive furnace tune-ups for Milwaukee-area homeowners following a thorough inspection protocol. Our NATE-certified technicians take the time to do the job right and explain what they find honestly. With 60+ years as a family-owned Milwaukee company, our reputation is built on integrity. Call 414-206-3049 to schedule your fall furnace tune-up. We're available 24/7 for heating emergencies, and GreenSky financing is offered on qualifying work.