Thermostat settings by state
Thermostat settings in Missouri
By Ismail Farooq · Updated 2026-10-30
How most homes heat: Natural gas furnaces and heat pumps; propane in rural areas.
Missouri has hot, humid summers and cold winters, with quick changes in spring and fall. Many days need heat in the morning and AC in the afternoon, which is where a thermostat’s auto changeover mode helps. Leave at least the default gap (usually 2–3 °F) between the heat and cool setpoints.
Older St. Louis homes often have boilers and radiators. Newer suburbs around both cities usually have gas furnaces or heat pumps with central AC.
Climate zones in Missouri
| Place | IECC zone |
|---|---|
| St. Louis | 4A |
| Kansas City | 4A |
| Springfield | 4A |
| Columbia | 4A |
| Kirksville | 5A |
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.
- Humid summers: use fan Auto, not On, and turn on the thermostat’s dehumidify or overcool setting if the house feels damp. Keep indoor humidity under about 60%.
- Cold, damp winters: if you have a humidifier, let the thermostat lower its target as it gets colder outside so windows don’t drip.
Heat pump lockouts for Missouri
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 |
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.