What to Check Before You Turn On Your AC for the First Time This Year
After months of sitting idle, your air conditioner deserves more than just a flip of the switch. Taking 20 minutes to run through a few simple checks now can save you from a sweltering house in July — and a costly emergency service call.
Here's what to do before you turn on your AC for the first time this season.
1. Replace or Clean the Air Filter A clogged filter is the number one cause of reduced AC performance. If you haven't replaced it since last fall, now is the time. A dirty filter forces your system to work harder, drives up your energy bill, and can cause the unit to freeze up on the first hot day.
2. Check the Outdoor Unit Head outside and inspect your condenser unit. Clear away any leaves, dirt, or debris that accumulated over winter. Make sure there's at least two feet of clearance around the unit. Gently straighten any bent fins with a fin comb if needed.
3. Test the Thermostat Set your thermostat to cool and drop the temperature below the current room temp. Give the system a few minutes to kick on. If it doesn't respond, check your batteries and circuit breaker before calling a technician.
4. Listen for Unusual Noises A healthy AC should hum quietly. Rattling, banging, or squealing sounds are red flags. Rattling could mean loose debris inside the unit. Squealing often points to a worn belt or bearing. Don't ignore these — catching them early is far cheaper than waiting.
5. Check Your Vents and Ductwork Walk through your home and make sure all supply and return vents are open and unobstructed. Furniture pushed against vents is a surprisingly common cause of uneven cooling. While you're at it, look for any visible duct damage in your basement or attic.
6. Test the Condensate Drain Your AC removes humidity from the air and drains it through a condensate line. A clogged drain line can cause water damage and trigger your system to shut off. Pour a cup of water into the drain pan and make sure it drains freely. A mixture of bleach and water poured into the line once a season keeps it clear.
7. Schedule a Professional Tune-Up Even if everything looks fine, an annual professional inspection is worth it. A technician will check refrigerant levels, electrical connections, and overall system efficiency — things you can't easily do yourself. Book early — HVAC companies get busy fast once the heat hits.
A little attention now goes a long way. Run through this list before the first hot day hits and you'll head into summer with confidence that your home is ready.
