Ah, summer. The season of popsicles, pool parties, and wondering why your electric bill looks like a mortgage payment. When the dog days hit and the air feels like soup, your air conditioner becomes the real MVP. But are you treating it right? Or are you unintentionally turning it into an overworked, overheated mess?
Real Simple asked HVAC pros about the biggest mistakes people make when trying to stay cool—and spoiler alert: some of them are way more common than you think. Here’s how not to end up sweaty, sad, and stuck calling for a repair on the hottest day of the year.
1. Cranking the Thermostat to Arctic Levels
We get it—you want to walk into your home and feel like you’ve entered a refrigerated spa. But setting your AC to 60°F when it’s 98°F outside isn’t going to cool things down faster. Most AC units can only cool to about 15–20 degrees below the outdoor temperature. So unless you live inside a walk-in freezer, dial it back a bit. Your AC—and your energy bill—will thank you.
2. Forgetting to Change the Filter (Again)
This one’s easy to forget—until your unit starts wheezing like a smoker running a marathon. A dirty filter makes your system work harder, reducing efficiency and potentially leading to breakdowns. Try to check it monthly during heavy-use seasons. If it looks like it’s wearing a sweater, it’s time for a new one.
3. Closing Doors or Blocking Vents Like It’s a Haunted House
Some folks think shutting doors and closing vents in unused rooms helps save energy. In reality, it messes with airflow and can cause pressure imbalances that put stress on your system. Your AC is not a mind reader—it needs a clear path to do its job. So keep those vents open and let the cool air flow freely, my friend.
4. DIY-ing Duct Seals with the Wrong Tape (No, Not That Kind)
Here’s a plot twist: duct tape is not for ducts. (Seriously.) It doesn’t hold up well to temperature changes and can peel off over time, making things worse. If you’re sealing ductwork, use foil tape or mastic sealant—aka the stuff that’s actually designed for the job.
5. Ignoring the Warning Signs
Your AC is trying to talk to you—are you listening? Strange noises, weak airflow, water leaks, or a unit that cycles on and off constantly are all signs it might be time for a checkup. Waiting too long could turn a small repair into a full-blown replacement. (And no one wants to be AC shopping in July. Trust me.)
