3 Things to Do Before Turning on AC: I Skipped #2 and Regretted It

Ladies, summer is coming. Is your AC ready?

Last year, I was too eager. As soon as it got hot, I turned on the AC. After two weeks, my allergies flared up and I coughed for a whole month. When I finally had it cleaned, the filter shocked me—a thick layer of dust like a carpet, with mold spots. The technician said an uncleaned AC is dirtier than a toilet. I really wanted to slap myself.

So this year, I’m doing it right. Here are the three things I’m doing ahead of time:

Task 1: Clean the Filter (Non-Negotiable)

This is the basics. Open the AC panel, pull out the filter, rinse with water. Use a soft brush for stubborn dust. For heavy buildup, soak in neutral detergent. Dry completely before reinstalling. I recommend monthly cleaning—especially important if you have elderly or kids at home.

Task 2: Deep Clean the Evaporator (What I Skipped Last Year)

The filter is just the first defense. The real grime hides in the evaporator—that dark, damp breeding ground for bacteria and mold. I ignored this last year, and when I turned on the AC, bacteria spores filled the room. This year I bought AC cleaner spray. Spray the evaporator, wait 15 minutes, then turn on the unit—dirty water drains out. If this sounds like too much, professional cleaning runs about $15-25.

Task 3: Check Drain Pipe and Outdoor Unit

A clogged drain pipe causes leaks. Dust on the outdoor unit affects cooling efficiency. Clean the drain pipe with a vacuum or flush with water. For the outdoor unit, wipe the heat sink with a damp cloth if you can safely reach it. But safety first—if it’s too hard to reach, don’t risk it.

My Money-Saving Tips

AC cleaner spray costs about $3-5 online and lasts several uses. Professional cleaning: $12-18 for wall units, $22-30 for floor units. I recommend DIY filter cleaning monthly, and professional evaporator cleaning every six months.

Don’t skip this expense. Think about it—one allergy doctor visit could cost way more than preventive maintenance. Plus, a clean AC cools better and uses less electricity.

I cleaned mine yesterday and tested it today. The air coming out smells fresh, and I feel so much better already.