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Your year-round AC maintenance schedule

The Imperial Valley has two seasons for cooling equipment: getting ready, and running hard. Here's what to do and when.

January–February: plan ahead

• Book your spring tune-up now, while HVAC companies have openings.
• Replace thermostat batteries.
• If your system is aging, get replacement estimates now instead of during a summer breakdown.

March: spring tune-up

• Professional tune-up before the first 100°F days.
• Fresh filter.
• Clear 2 feet around the outdoor unit and rinse the coil.

April: swamp cooler startup

• New or cleaned pads, scrubbed pan, pump and float check. See the swamp cooler guide.
• Test the AC on the first warm day so you find problems before the heat.

May–September: peak season

• Check the filter every month and change it when it's gray.
• Flush the condensate drain with vinegar every few months.
• Rinse the outdoor coil after dust storms.
• Watch for ice on the copper lines, warm air, or short cycling, and turn the system off and call a pro if you see them.

October: wind down

• Shut down, drain and cover swamp coolers.
• Change the filter after the long season.

November–December: heating check

• Heat pumps and furnaces get a quick check before cool nights.
• Test smoke and carbon monoxide detectors if you have gas heat.