What maintenance should be done on an AC unit yearly?

Yearly AC maintenance should include a professional tune-up with cleaning, performance testing, electrical and safety checks, and thermostat calibration. Most issues we find come from dirt buildup and loose electrical connections that make the system work harder than it should. A slightly miscalibrated thermostat can also keep the AC running longer than needed. We perform these services for homeowners throughout the Wellesley area as part of our regular seasonal visits. Maintenance plans with priority scheduling and repair discounts are available.

Here are the core tasks a technician completes each year:

• Clean coils and replace or clean filters
• Tighten electrical connections and inspect wiring
• Check refrigerant levels and test for leaks
• Inspect the condensate drain and verify a full, safe system cycle

Schedule service before peak summer to catch small issues early and avoid breakdowns.

Updated: 2026-04-06

Need help in Wellesley, MA? Call (508) 501-9990 or book online.