What a Real HVAC Tune-Up Includes (and How to Spot a Rushed One)

"Tune-up" can mean a thorough inspection that catches problems early, or a fifteen-minute look that ends in a sales pitch. Both get called the same thing. This guide lays out what a real tune-up includes for each type of system, what you should get when it's done, and how to tell the difference.

Why tune-ups matter

Most breakdowns don't happen out of nowhere. A weak capacitor, a clogged drain line or a dirty coil gives warning signs months ahead, and a tune-up is when those get caught. Regular maintenance also keeps the system running efficiently, and some manufacturer warranties require proof of regular maintenance.

Cooling tune-up checklist (AC and heat pump, spring)

• Clean the outdoor coil and clear debris from around the unit
• Measure refrigerant pressures and temperatures to confirm the charge is correct
• Test the capacitor against its rating and inspect the contactor
• Measure the amp draw of the compressor and fan motors
• Tighten electrical connections and check the wiring for heat damage
• Flush the condensate drain line and test the float switch
• Measure the temperature difference between the supply and return air
• Check the filter, blower and thermostat operation

Heat pump heating checklist (fall)

• Test the defrost cycle and the defrost sensor
• Confirm the reversing valve switches properly
• Test the backup electric heat strips and their controls
• Check the refrigerant charge in heating mode
• Confirm the thermostat is set up correctly for a heat pump

Gas furnace checklist (fall)

• Inspect and clean the burners and the flame sensor
• Test the igniter and all safety and limit switches
• Inspect the heat exchanger for cracks or corrosion
• Check the gas pressure and test for carbon monoxide
• Inspect the flue and venting for blockages or leaks
• Check the blower and filter

What you should get afterward

A real tune-up ends with more than "everything looks good." You should get a short written report: what was checked, the key readings, anything that's starting to wear, and an honest note on what can wait and what can't. If a part is borderline, you should hear that it's borderline, not that it has to be replaced today.

Signs of a rushed tune-up

• The technician is in and out in 15 to 20 minutes. A thorough visit usually takes 45 to 90 minutes per system.
• No gauges or meters come out, and no readings are recorded.
• The outdoor coil isn't cleaned and the drain isn't checked.
• A very low-priced "special" turns into pressure to buy a major repair or a new system on the spot.

How often to schedule

Heat pumps run year-round here, so we recommend two visits a year: cooling in spring and heating in fall. Homes with a gas furnace and central air should have the AC checked in spring and the furnace checked in fall. A maintenance plan bundles both visits and typically adds priority scheduling.

What you can do between visits

• Change the filter on schedule.
• Keep 2 feet of clearance around the outdoor unit.
• Make sure supply vents and return grilles aren't blocked by furniture or rugs.
• Pay attention to new noises, smells or rising bills, and call early.