How Many kWh Does a Smart Thermostat Use?
Smart Thermostat energy cost calculator — see your exact daily, monthly, and yearly electricity cost.
US national average. Edit for your local rate.
Daily Energy Use
0.07
kWh / day
Monthly Cost
$0.41
Yearly Cost
$4.95
Smart Thermostat — Cost Breakdown
| Period | kWh Used | Cost ($) |
|---|---|---|
| Per Hour | 0.0030 | $0.0006 |
| Per Day | 0.07 | $0.01 |
| Per Month (30 days) | 2.16 | $0.41 |
| Per Year (365 days) | 26.28 | $4.95 |
Running a smart thermostat all day uses less energy than a single LED night light.
3 Ways to Cut Your Smart Thermostat Energy Bill
- 🌱
Enable the learning schedule feature so it automatically adjusts to your patterns instead of running heating/cooling when you're away.
- 💡
Use the home/away sensing to avoid heating or cooling an empty house — this alone saves 10–15% on HVAC energy.
- ⚡
Set seasonal temperature ranges (68°F winter heat, 76°F summer cool) as the baseline for maximum savings.
Smart thermostats are ultra-low-power electronics drawing tiny, consistent wattage from the HVAC system's 24V transformer with no surge.