Your thermostat setting can make or break your summer. Pick the wrong number and you either sweat through July or open a power bill that makes your stomach drop. So let’s settle it right now.
The quick answer: set your thermostat to 78°F when you’re home and awake. Bump it up to 85°F when you leave the house. Drop it a few degrees at night if you sleep better cool. That’s the baseline most HVAC pros and energy experts recommend. But Idaho Falls has its own quirks, and we’ll walk through those below.
Why 78°F Works for Most Homes
Seventy-eight degrees isn’t a random number. It comes from national energy guidance built around one simple idea. The smaller the gap between your indoor and outdoor temperatures, the less your AC has to work. Less work means lower bills and less wear on your system.
You can read more about the reasoning behind this guidance from the U.S. Department of Energy.
Why Idaho Falls Homes Can Often Go a Few Degrees Warmer
Our summers run dry, not muggy. That matters more than most homeowners realize. Humidity is what makes heat feel unbearable. Dry air lets your body cool itself through natural evaporation, so 78°F here often feels like 74°F in a humid state.
That means many Idaho Falls homes can comfortably sit at 78°F, or even push toward 80°F, without anyone noticing much difference. Add a ceiling fan, and you can often go a degree or two higher still. Fans move air across your skin, speeding up evaporation and cooling your body even if the room temperature stays the same.
What to Set Your Thermostat to When You’re Away
Don’t cool an empty house. If nobody is home for more than four hours, raise the thermostat to around 85°F. Your AC will still run enough to protect against summer humidity spikes and keep indoor materials safe from heat damage. It just won’t work overtime, chilling rooms nobody is sitting in.
Smart thermostats make this easy. Set a schedule once and let the system handle the rest.
What About Nighttime?
Most people sleep better when the room is a touch cooler. Try 74°F to 76°F at night paired with a ceiling fan on low. You get the comfort of a cooler-feeling room without asking your AC to work as hard as a straight temperature drop would require.
When 78°F Doesn’t Feel Right
If you set your thermostat to 78°F and your house still feels muggy, uneven room to room, or the unit is still running constantly. The temperature probably isn’t your real problem. That points to something mechanical. A few common culprits:
- Faulty thermostat
- Low refrigerant levels
- A dirty or clogged air filter
- Ductwork that’s leaking cool air into your attic or crawlspace
- An aging system that can no longer keep pace with Idaho Falls summer highs
A properly running AC should hit your thermostat setting and hold it there; if it can’t, don’t just push the temperature lower and hope. That’s a losing battle that spikes your bill and shortens your unit’s life.
The Bottom Line
Start at 78°F when you’re home, 85°F when you’re away, and a few degrees cooler at night if that helps you sleep. Idaho Falls’ dry climate gives you room to experiment upward from there. If your AC can’t hold a comfortable temperature no matter where you set it, that’s your sign to get it looked at.
We’d rather help you fix a small issue now than watch it turn into a July breakdown. Check out how RSJ Mechanical takes care of Idaho Falls homes and schedule a service appointment today. Let us make sure your system is ready for the heat. Have questions first? Contact us, and we’ll walk you through it. We have years of high-quality experience, but don’t just take our word for it. Check out what your neighbors think before you decide who to call.
Frequently Asked Questions About Temperature Settings In Idaho Falls
Is 78°F actually the best thermostat setting for summer?
It’s a solid starting point recommended by national energy guidance, but comfort varies by home and climate. In Idaho Falls’ dry air, many homeowners find they’re just as comfortable at 78°F to 80°F as they would be at 74°F in a humid state.
Does raising my thermostat a few degrees really save that much money?
Yes. Each degree you raise your thermostat in summer can lower your cooling costs by roughly 1 to 3 percent. Raising it from 72°F to 78°F can add up to meaningful savings over a full summer.
Why does my house still feel hot even at a low thermostat setting?
That usually means your AC is struggling, not that the setting is wrong. Common causes include low refrigerant, a dirty filter, leaky ductwork, or a unit that’s simply too old to keep up with demand.