What Happens During an AC Tune-Up (and How Often)

An air conditioner tune-up is a scheduled inspection and cleaning visit. A technician checks the parts that wear, measures how the system is running, and catches small problems before they turn into a breakdown on a hot day. This guide explains what a thorough tune-up covers, how often you need one, and which upkeep you can handle yourself.

How often you need a tune-up

ENERGY STAR recommends an annual pre-season checkup for your heating and cooling equipment. Its ENERGY STAR maintenance checklist advises checking the cooling system in the spring and the heating system in the fall, because contractors get busy once summer and winter arrive.

For most Minnesota homes, that means one air conditioner tune-up each spring, before the first humid stretch of weather. Your air conditioner sits idle through a long winter, and the outdoor unit is exposed to snow, ice and spring runoff. A spring visit lets a technician find anything that changed while it was off.

If you have a heat pump, it heats and cools, so it runs most of the year. Ask about checking it in both spring and fall.

What the technician checks and cleans

A complete tune-up covers the outdoor unit, the indoor coil and blower, the electrical system and the controls. Based on the ENERGY STAR checklist and the U.S. Department of Energy's air conditioner maintenance guide, a professional checkup should include:

Cooling performance

• Clean the evaporator (indoor) and condenser (outdoor) coils
• Check the refrigerant charge and adjust it if needed
• Test for refrigerant leaks
• Measure airflow through the evaporator coil

Electrical and mechanical

• Inspect, clean and tighten electrical connections
• Measure motor voltage and current
• Lubricate moving parts, and check belts for tightness and wear where the system has them
• Clean and adjust blower components

Controls and drainage

• Test the system controls and startup cycle for safe, correct operation
• Verify that the heating and cooling cannot run at the same time
• Check thermostat accuracy and settings
• Inspect the condensate drain so water does not back up

Ducts

• Check for duct leaks on central systems and seal them where accessible

Ask your contractor for a written list of what their tune-up includes, along with the readings they take. A visit that only rinses the outdoor coil is not a full tune-up.

Why the tune-up matters

Each part of the checklist has a specific purpose:

• Airflow. ENERGY STAR notes that airflow problems can reduce system efficiency by up to 15 percent. Restricted airflow is also a common cause of a frozen coil.
• Refrigerant. A correct charge lets the system cool as designed. A low charge means there is a leak, and finding it early limits refrigerant loss.
• Electrical connections. Loose connections can cause parts to overheat and fail.
• Drainage. A clogged drain can stop moisture removal and cause water stains on walls, ceilings or carpet.

Regular maintenance records also help when you file a warranty claim. Some manufacturer warranties ask for proof of professional maintenance, so read the terms on your equipment and keep your service invoices.

What you can safely do between visits

• Check the air filter monthly. ENERGY STAR recommends inspecting it monthly. The DOE suggests cleaning or replacing it every month or two during cooling season, more often with pets or dusty conditions.
• Keep the outdoor unit clear. The DOE recommends trimming plants back at least 2 feet from the condenser. Remove leaves, grass clippings and debris, and keep dryer vents from blowing lint onto the coil.
• Check the condensate drain. Look for standing water around the furnace or a condensate pump that does not run.
• Keep vents and returns open. Move furniture and rugs away from supply registers and return grilles.
• Protect the outdoor unit in winter. The DOE suggests covering outdoor central units. Remove the cover before you turn on cooling in the spring.

Do not open electrical panels, bend coil fins with tools, or add refrigerant. Turn off power at the outdoor disconnect and the breaker before you clear debris near the unit. If you ever smell burning or see smoke, shut the system off at the breaker, leave the area and call 911 if there is fire.

When to call a professional

Book a tune-up each spring before regular cooling begins. Schedule a service call sooner if your system blows warm air, cycles on and off often, makes new noises, leaks water, or shows ice on the lines.

Our air conditioning maintenance service covers the checks above. If you want both your spring AC tune-up and your fall furnace tune-up on a schedule, the Krinkie's Club maintenance plan includes two tune-ups a year, along with priority service and a discount on repairs.

Common questions

Sources

• ENERGY STAR — Maintenance Checklist
• U.S. Department of Energy — Maintaining Your Air Conditioner