Thermostat Energy Savings Calculator
Setting your thermostat back while you sleep or are away is one of the simplest ways to cut energy bills. Estimate your yearly savings from a setback schedule.
How to use the Thermostat Energy Savings Calculator
- Enter your yearly heating (or cooling) cost.
- Enter how many degrees you will set the thermostat back.
- Enter how many hours per day the setback lasts.
How it works
The estimate uses the common rule of thumb of about 1% savings for each degree Fahrenheit of setback held for 8 hours. The U.S. Department of Energy notes that turning the thermostat back 7–10 °F for 8 hours a day can save up to 10% a year. Savings are capped at 15% here because the rule weakens for large setbacks, and homes with heat pumps or radiant floors may save less.
Estimated savings on a $1,200 yearly bill
| Setback | 8 hours/day | 12 hours/day |
|---|---|---|
| 2 °F | $24 | $36 |
| 4 °F | $48 | $72 |
| 6 °F | $72 | $108 |
| 8 °F | $96 | $144 |
| 10 °F | $120 | $180 |
Frequently asked questions
What is the most energy-efficient thermostat setting?
The DOE suggests about 68 °F (20 °C) in winter while awake and lower while asleep or away, and 78 °F (26 °C) in summer when home.
Does turning the heat down at night save money?
Yes. A lower indoor temperature reduces heat loss, so the system uses less energy overall, even counting the recovery period.
Do smart thermostats save money?
They make setbacks automatic, which is where most savings come from.