Annual HVAC Maintenance Checklist for Chicago Homeowners

Spring AC Tune-Up Checklist (April–May)

• Replace or clean air filter
• Clear debris from around outdoor condenser unit
• Gently clean condenser coil fins
• Check refrigerant level and inspect lines for leaks
• Test thermostat calibration and programming
• Inspect electrical connections and capacitors
• Clear and treat condensate drain line
• Check blower wheel and motor operation
• Measure supply and return air temperature differential
• Test all safety controls

Fall Furnace Tune-Up Checklist (September–October)

• Replace or clean air filter
• Inspect heat exchanger for cracks (CO safety)
• Clean burners and test ignition sequence
• Test and clean flame sensor
• Check and adjust gas pressure
• Inspect flue pipe and combustion venting
• Lubricate blower motor bearings
• Test all safety limits and controls
• Check carbon monoxide detectors throughout home
• Test thermostat in heating mode

Year-Round Tasks

• Check filter monthly, replace as needed
• Keep vents and registers clear of furniture
• Listen for unusual sounds from equipment
• Monitor energy bills for unexplained increases
• Keep outdoor unit clear of snow and ice in winter