As an HVAC professional in Minnesota, I get this question all the time:
“What’s the best AC temperature for energy saving?”
It’s a smart question—because the right temperature setting can help keep your home cool and your utility bills under control during those hot summer months. In this post, I’ll break down real-world tips and practical advice on how to set your thermostat for maximum efficiency and comfort.
So, What’s the Ideal AC Temperature for Saving Energy?
Most energy experts—and from my experience too—recommend setting your thermostat to 78°F (25.5°C) when you’re at home and need cooling. This is widely recognized as the sweet spot that balances comfort with energy efficiency.
Why 78°F?
Because at 78°F, your AC system doesn’t have to work as hard to cool your home. Lowering the temperature even a few degrees (say, to 72°F) might feel refreshing—but it can significantly increase your energy usage and costs.
How to Adjust Based on Your Daily Routine
While 78°F is the recommended baseline, you can adjust the thermostat based on your activities:
- When at home: Keep it at 78°F to maintain comfort and efficiency.
- When away: Raise it to 85°F to reduce energy use while preventing your home from overheating.
- When sleeping: Try 74°F–76°F, especially if you’re sensitive to heat at night. Pair this with a ceiling fan for extra comfort.
How Humidity Impacts Temperature in Minnesota
Minnesota isn’t Florida, but we still get our fair share of humid summer days. And humidity plays a huge role in how warm or cool your home feels.
A room at 78°F with high humidity can feel sticky and uncomfortable. In such cases:
- Use a dehumidifier to remove excess moisture.
- Set your AC to ‘Auto’ mode rather than ‘On’ to help regulate both temperature and humidity effectively.
Quick Tips to Maximize Efficiency at 78°F
Here are some easy ways to help your AC work smarter, not harder:
- ✅ Seal windows and doors to stop cool air from leaking out.
- ✅ Use blackout curtains or thermal shades to block direct sunlight.
- ✅ Switch ceiling fans to summer mode (counterclockwise) to push cool air downward.
- ✅ Clean your AC filters regularly for better airflow and performance.
Don’t Forget: Thermostat Placement Matters
One overlooked factor is where your thermostat is located. If it’s placed near sunny windows, above hot appliances, or in rarely used hallways, it could produce false readings.
💡 Pro tip: Your thermostat should be installed in a central, shaded area of your home to ensure accurate readings and efficient system operation.
Best Thermostat Settings for Vacations
Leaving town for a few days or a long weekend? Don’t forget to adjust your settings:
- Set the thermostat to 85°F to conserve energy.
- If you’re away for a week or more, consider using a smart thermostat so you can adjust the temperature remotely and return to a cool home.
In a Nutshell
So, what’s the best AC temperature for energy saving?
78°F is the golden number—but energy savings come from more than just a setting. The key is to combine smart temperature control with efficient habits, humidity management, and home upgrades that reduce strain on your system.
In Minnesota’s variable summer climate, a thoughtful approach to your thermostat can mean better comfort and lower energy bills—without sacrificing cool air.
FAQs
Q1. Is 78°F really the best AC temperature for energy saving?
Yes. It’s widely recommended by the U.S. Department of Energy and balances comfort with efficiency when you’re home.
Q2. Will 78°F feel too warm in the summer?
Not if your home is properly sealed and you use ceiling fans or a dehumidifier. These can make 78°F feel significantly cooler.
Q3. How much can I save by raising my thermostat?
You can save around 3% per degree for every degree above 72°F, according to the U.S. Department of Energy. Over a summer, that adds up fast.
