The short answer
A real tune-up measures the system as well as cleaning it: refrigerant pressures and temperatures, electrical parts under load, airflow and the condensate drain, plus cleaning the coils. ENERGY STAR recommends a professional cooling check every spring. A visit that produced no readings was an inspection, not a tune-up.
Why does a spring tune-up matter on the coast?
The cooling season here is long and it starts early, so an air conditioner works more hours than the same unit would further north. Most of what fails in July was detectable in April: a capacitor drifting out of tolerance, a drain starting to clog, a coil losing capacity to salt and pollen. ENERGY STAR recommends the cooling check in spring and the heating check in fall, before contractors get busy.
What should the technician measure?
- Refrigerant pressures and line temperatures, compared with the manufacturer's charging data
- Capacitors, tested against their rated value
- Voltage, and the current drawn by the compressor and fan motors
- The temperature drop across the indoor coil
- Airflow, and whether the blower is set correctly for the system
- The thermostat: that it calls, and that the system responds
Measurements are the point. They are what show a part on its way out while it can still be replaced on a schedule rather than in an emergency.
What should be cleaned, cleared or tightened?
- The outdoor coil, rinsed and checked for bent or corroded fins
- The indoor coil and drain pan, inspected and cleaned if needed
- The condensate drain line flushed, and any float switch tested
- Electrical connections tightened and the contactor checked for pitting
- Moving parts lubricated where the equipment calls for it
- The filter changed
In a humid climate the drain matters more than it looks: a blocked condensate line is the most common nuisance failure here, and the one most likely to damage a ceiling.
What should you get at the end?
The readings, and a plain account of what was found. If a part is near the end of its life, you should hear what it is, why, and what replacing it costs — before anything is done. A tune-up is not a sales visit, and nothing should be replaced without your agreement.
What does it cost, and is a plan worth it?
A single AC tune-up starts at $129. Annual maintenance plans cover the visits in advance:
- Essential Comfort — $179/year (1 maintenance visit, inspection, drain check, filter check)
- Preferred Comfort — most popular — $249/year (2 seasonal visits, priority scheduling, 10% repair discount)
- Premium Comfort — $349/year (2 visits, priority service, 15% repair discount, drain treatment, reduced diagnostic)
- Additional system — +$149/year (Second HVAC system)
- Mini-split, single zone — $169/year (Annual service)
- Extra mini-split head — +$99/year (Additional indoor head)
What can you do between visits?
Check the filter monthly, keep plants and stored items clear of the outdoor unit, and with the power off at the disconnect, rinse the outdoor coil gently with a garden hose — never a pressure washer. Pouring a cup of water into the condensate pan and watching it drain is a quick test of the line.
Also asked.
- How often should an air conditioner be serviced?
- Once a year at minimum, in spring before the cooling season. In a long coastal season, two visits a year — cooling in spring, heating in fall — is the standard recommendation.
- Do I need maintenance to keep the manufacturer's warranty?
- Some manufacturer warranties expect evidence of regular professional maintenance, and all of them require the equipment to be registered. Keep the service paperwork with the registration documents.
Sources
- ↗Maintenance Checklist — ENERGY STAR (U.S. EPA)