Thermostat settings by state
Thermostat settings in Colorado
By Ismail Farooq · Updated 2026-10-30
How most homes heat: Natural gas furnaces in most of the Front Range; propane and electric in the mountains. Heat pumps are growing quickly.
Colorado is dry, sunny and cold in winter, with big swings between day and night. Gas furnaces handle that well, and deep overnight setbacks are fine. Sunny afternoons can overheat south-facing rooms while the rest of the house is cool, which is where a smart thermostat with remote room sensors helps.
Winter air is very dry. If you have a whole-house humidifier, wire it to the thermostat’s accessory terminals so it can lower the target humidity as it gets colder outside and avoid condensation on windows. Mountain towns in zones 6 and 7 need a sensible freeze-protection away setting, especially in second homes.
Climate zones in Colorado
| Place | IECC zone |
|---|---|
| Grand Junction | 5B |
| Denver | 5B |
| Colorado Springs | 5B |
| Fort Collins | 5B |
| Aspen | 7 |
Zones follow county lines on the 2021 IECC map, and some counties changed zone between code editions. DOE’s Building America climate zone map lists every county.
Starting settings
- Everyday setpoints: about 68 °F in winter and 78 °F in summer while you’re home, set back while you sleep or are out (DOE’s guidance).
- Gas, oil or propane furnace or boiler: setbacks of 7 to 10 °F are fine; use the thermostat’s early-start feature so the house is warm on time.
- Heat pump: keep winter setbacks small (2 to 4 °F) so a cold morning doesn’t bring on aux heat.
- Dry air: a higher cooling setpoint still feels comfortable, and winter air gets very dry. A whole-house humidifier wired to the thermostat should aim for about 30–40%, lower in very cold weather.
- Freeze protection: keep the away or minimum temperature at about 55 °F or higher in winter, and make sure the thermostat keeps working without Wi-Fi.
Heat pump lockouts for Colorado
If you have a heat pump, these are starting points for the outdoor temperatures that control backup heat. Your installer’s balance point is better if you have it.
| Zone | Aux heat lockout (electric strips) | Compressor lockout (dual fuel) |
|---|---|---|
| 4 | 30–35 °F | Around 25–35 °F |
| 5 | 25–35 °F for a standard heat pump; lower for a cold-climate model | Around 20–35 °F |
| 6–8 | From the heat pump’s rated output at low temperatures; cold-climate models often run well below 10 °F | Often 0–25 °F, from the installer’s balance point |
Rebates
Many utilities give rebates or bill credits for smart thermostats, sometimes in return for joining a peak-day program. Programs change often, so check your electric and gas utility’s website, or search by ZIP code in the ENERGY STAR rebate finder.