It’s the age-old summer debate: Do you shut the AC off when you head to work to save money, or does that just make the unit work twice as hard to cool a “sauna” when you get home?
If you’ve been religiously killing the power every morning thinking you’re saving a fortune, I have some news that might make you want to hug your thermostat (or at least stop hovering over it).
The Big Myth: “It Works Harder Later”
You’ve probably heard someone say, “Don’t turn it off! The AC has to work overtime to cool a hot house, and you’ll spend more in the long run.” The reality? That’s not actually how physics works.
Your home loses “coolness” much slower when the inside temp is closer to the outside temp. When your house is 78°F and it’s 90°F outside, the heat stays out fairly well. When your house is a crisp 68°F, the heat is practically kicking down the door to get in.
So, Should You Turn It Off?
The short answer: No. But not for the reason you think.
While turning it off does technically save the most energy, it’s a terrible idea for your home’s health. Your AC isn’t just a giant ice cube – it’s a dehumidifier.
If you shut it off for 9 hours in July:
- Humidity levels skyrocket. This makes your hardwood floors swell, your doors stick, and can even invite mold to the party.
- Your furniture suffers. High humidity and heat aren’t great for electronics or wood.
- The “Recovery” period sucks. You’ll get home at 5:30 PM, and it might take until 9:00 PM for the house to actually feel comfortable again.
The “Sweet Spot” Strategy
Instead of the “On/Off” battle, try the 7-to-10 Degree Rule.
If you usually keep your house at 72°F while you’re home, bump it up to 78°F before you head out.
- The Benefit: You save about 3% on your cooling bill for every degree you raise the temp.
- The Result: The AC still kicks on occasionally to pull moisture out of the air, keeping your home dry and safe, but it isn’t burning cash trying to keep an empty house “refrigerator cold.”
Make It Automatic (The Lazy Way to Save)
If you’re still rocking a manual thermostat, you’re basically doing math every time you leave the house. Upgrading to a programmable or smart thermostat is the single best move you can make.
You can set it to start cooling the house down 30 minutes before you get home. You walk into a cool house, and your bank account never knew the difference.
Is Your AC Working Too Hard? Contact Roman Home Services in Milwaukee, WI and the Surrounding Areas Today!
If you find yourself bumping the temp up but your electric bill is still through the roof, your system might be struggling with a dirty coil or a leak.
The team at Roman Home Services can check your system’s “vitals” to make sure it’s running as efficiently as possible. We’re all about helping our neighbors keep their cool without breaking the bank. Contact us today!


