What a tune-up includes
- Checking refrigerant pressures and temperature drop
- Testing capacitors, contactors and electrical connections
- Cleaning or rinsing the outdoor coil
- Clearing the condensate drain line
- Checking the blower, belts and motors
- Testing the thermostat and safety controls
- On furnaces: inspecting burners, flame sensor and venting
Why yearly service pays off
Tune-ups catch small problems, like a weak capacitor or a clogged drain, before they cause a breakdown on the hottest or coldest day of the year. Many equipment warranties also expect regular maintenance.
What you can do between visits
- Change the air filter every one to three months.
- Keep two feet of clear space around the outdoor unit.
- Keep supply vents and return grilles open and unblocked.
- Watch for water around the indoor unit or a drain pan that's full.