🏠 Household
How Much Does a Smart Thermostat Cost to Run?
At the current U.S. average rate of 18.3¢/kWh (July 2026), a smart thermostat costs about $0.13 per month at typical usage — 24 hours/day (always on).
Per hour
0.0¢
at 1 W
Per day
0.4¢
24 hours/day (always on)
Per month
$0.13
0.7 kWh
Per year
$1.60
8.8 kWh
The thermostat itself draws about a watt — irrelevant. Its value runs the other direction: schedule-driven setbacks typically trim 5–10% from heating and cooling, making it one of the few devices with a negative effective cost.
Calculate it for your home
Per hour
0.0¢
Per day
0.4¢
Per month
$0.13
Per year
$1.60
Uses 0.7 kWh/month at 18.3¢ per kWh.
Cheapest and most expensive states
Monthly cost at typical usage, using each state's current average residential rate.
Cost in every state
| State | Rate (¢/kWh) | Per hour | Per month | Per year |
|---|---|---|---|---|
| Louisiana | 12.7 | 0.0¢ | 9.3¢ | $1.11 |
| Nevada | 12.8 | 0.0¢ | 9.3¢ | $1.12 |
| Utah | 13.1 | 0.0¢ | $0.10 | $1.15 |
| North Dakota | 13.4 | 0.0¢ | $0.10 | $1.17 |
| Idaho | 13.7 | 0.0¢ | $0.10 | $1.20 |
| Tennessee | 13.7 | 0.0¢ | $0.10 | $1.20 |
| Kentucky | 13.8 | 0.0¢ | $0.10 | $1.21 |
| Nebraska | 13.8 | 0.0¢ | $0.10 | $1.21 |
| Arkansas | 14.3 | 0.0¢ | $0.10 | $1.25 |
| Oklahoma | 14.4 | 0.0¢ | $0.11 | $1.26 |
| Wyoming | 14.4 | 0.0¢ | $0.11 | $1.26 |
| Mississippi | 14.5 | 0.0¢ | $0.11 | $1.27 |
| Washington | 14.7 | 0.0¢ | $0.11 | $1.29 |
| Florida | 15.0 | 0.0¢ | $0.11 | $1.31 |
| Montana | 15.0 | 0.0¢ | $0.11 | $1.31 |
| North Carolina | 15.2 | 0.0¢ | $0.11 | $1.33 |
| Kansas | 15.3 | 0.0¢ | $0.11 | $1.34 |
| Arizona | 15.4 | 0.0¢ | $0.11 | $1.35 |
| South Dakota | 15.4 | 0.0¢ | $0.11 | $1.35 |
| South Carolina | 15.5 | 0.0¢ | $0.11 | $1.36 |
| West Virginia | 15.8 | 0.0¢ | $0.12 | $1.38 |
| Texas | 15.9 | 0.0¢ | $0.12 | $1.39 |
| Iowa | 16.0 | 0.0¢ | $0.12 | $1.40 |
| Oregon | 16.0 | 0.0¢ | $0.12 | $1.40 |
| Missouri | 16.1 | 0.0¢ | $0.12 | $1.41 |
| New Mexico | 16.1 | 0.0¢ | $0.12 | $1.41 |
| Georgia | 16.3 | 0.0¢ | $0.12 | $1.43 |
| Alabama | 16.4 | 0.0¢ | $0.12 | $1.44 |
| Indiana | 16.7 | 0.0¢ | $0.12 | $1.46 |
| Colorado | 17.0 | 0.0¢ | $0.12 | $1.49 |
| Minnesota | 17.5 | 0.0¢ | $0.13 | $1.53 |
| Virginia | 17.6 | 0.0¢ | $0.13 | $1.54 |
| Delaware | 18.5 | 0.0¢ | $0.13 | $1.62 |
| Wisconsin | 19.1 | 0.0¢ | $0.14 | $1.67 |
| Illinois | 19.2 | 0.0¢ | $0.14 | $1.68 |
| Ohio | 19.5 | 0.0¢ | $0.14 | $1.71 |
| Maryland | 21.4 | 0.0¢ | $0.16 | $1.87 |
| Pennsylvania | 21.7 | 0.0¢ | $0.16 | $1.90 |
| Michigan | 23.1 | 0.0¢ | $0.17 | $2.02 |
| Vermont | 23.8 | 0.0¢ | $0.17 | $2.08 |
| Connecticut | 24.2 | 0.0¢ | $0.18 | $2.12 |
| Washington, D.C. | 25.2 | 0.0¢ | $0.18 | $2.21 |
| New Jersey | 25.2 | 0.0¢ | $0.18 | $2.21 |
| New Hampshire | 26.6 | 0.0¢ | $0.19 | $2.33 |
| Rhode Island | 28.3 | 0.0¢ | $0.21 | $2.48 |
| Alaska | 28.8 | 0.0¢ | $0.21 | $2.52 |
| New York | 29.9 | 0.0¢ | $0.22 | $2.62 |
| Massachusetts | 30.5 | 0.0¢ | $0.22 | $2.67 |
| Maine | 32.4 | 0.0¢ | $0.24 | $2.84 |
| California | 33.6 | 0.0¢ | $0.25 | $2.94 |
| Hawaii | 48.0 | 0.0¢ | $0.35 | $4.20 |
How to lower the cost
- Always-on devices are the quiet budget line: audit anything that runs 24/7.
- Auto modes with sensors (purifiers, dehumidifiers) cut runtime dramatically versus always-on.
- A smart plug with energy monitoring answers “what does this actually use?” for $10.
Frequently asked questions
How much electricity does a smart thermostat use?
A typical smart thermostat draws about 1 watts in use. At 24 hours/day (always on), that works out to roughly 0.0 kWh per day, or 0.7 kWh per month.
How much does it cost to run a smart thermostat for 1 hour?
At the current U.S. average residential rate of 18.3¢/kWh, one hour costs about 0.0¢. In Louisiana (12.7¢/kWh) it's 0.0¢, while in Hawaii (48¢/kWh) it's 0.0¢.
How much does a smart thermostat cost to run per month?
With typical usage (24 hours/day (always on)), expect about $0.13 per month at the U.S. average rate — from 9.3¢ in Louisiana up to $0.35 in Hawaii. Rates are as of July 2026.
Does a smart thermostat use a lot of electricity?
Not really — at typical usage it's under 1% of an average home's monthly consumption. Heating, cooling, hot water, and drying are the loads that move bills.