How many of us turn off the AC when we leave for the day, come home to a hot house, and immediately crank it down to cool it off ASAP?
That move can actually cost you more.
Your AC isn’t built to instantly cool a hot house—it’s built to maintain a comfortable temperature.
So instead of overworking your system, here’s how to set it the right way.
The “Best” Temperature
There’s no single perfect number- but there is a range that balances comfort and efficiency.
- 78°F when you’re home → best balance of comfort + efficiency
- 85°F when you’re away → saves energy without overheating your home
- Lower at night if needed → comfort matters, especially for sleep
You can save up to 10% a year just by adjusting your thermostat 7–10 degrees for about 8 hours a day.
What to Set Based on Your Day
Here’s what that looks like in real life:
| Situation | Recommended Setting |
| Home during the day | 76–78°F |
| Away at work | 82–85°F |
| Sleeping | 72–76°F (comfort-based) |
| Vacation (3+ days) | ~85°F (avoid going over 90°F) |
Key idea: The smaller the gap between indoor and outdoor temps, the lower your energy bill.
Does It Matter If You’re Home All Day?
A little—but not as much as people think.
If you’re home:
- Keep it around 76–78°F
- Use ceiling fans to feel 3–4° cooler without lowering the thermostat
Big swings (like dropping to 70°) are what drive bills up—not steady use.
What About Pets or Kids?
Yes, it matters—but not drastically.
- Pets: Most are fine up to ~80–82°F
- Infants/young kids: Keep it more stable (around 72–76°F)
- Elderly: May need cooler, more consistent temps
If comfort or health is a concern, prioritize that over energy savings.
Bottom Line
- Set it higher when you’re away, lower when you’re home
- Keep temperatures steady instead of making big swings
- Let your system maintain comfort, not chase it
Dial it in once, automate it, and you’ll stay comfortable.
