Nest Support

Questions about Nest Learning Thermostat or Nest Protect: Smoke + CO alarm? We've got answers, videos, and plenty of resources to help you out.

How do Safety Temperatures on the Nest Learning Thermostat work?

Set Safety Temperatures on the Nest Learning Thermostat to prevent the temperature from going above or below certain limits.

You can set Safety Temperatures to prevent extreme high and low temperatures in your home. If the current room temperature goes above or below the Safety Temperatures you’ve set, your Nest Thermostat will automatically start heating or cooling.

You can set both a high and a low Safety Temperature. If the room temperature drops below the low Safety Temperature the Nest Thermostat will automatically start heating. If it goes above the high Safety Temperature the Nest Thermostat will automatically start cooling.

You can set or change Safety Temperatures in SETTINGS > EQUIPMENT. If you decide not to set your own Safety Temperatures, the Nest Thermostat's default low Safety Temperature is 45ºF/7ºC to prevent the home from freezing. The Nest Thermostat doesn’t have a default high Safety Temperature. Note that your Nest Thermostat will never cool when the temperature is below 45ºF/7ºC or heat when the temperature is above 95ºF/35ºC. These limits cannot be changed.

Safety Temperatures are different from the Away temperatures you’ll choose during thermostat setup. Away temperatures are the temperatures that the Nest Thermostat will maintain only when it’s in Away mode. Choose Away temperatures that save energy and are appropriate for your home.

Safety Temperatures can also help protect a second home. A Safety Temperature of 45ºF/7ºC (Nest Thermostat's default) will prevent the pipes from freezing while the home is unoccupied, even if the thermostat was left in cooling mode or doesn’t have a heating schedule. You’ll never have to worry if you’ve set the thermostat correctly before you leave, but you can always check your home’s temperature with your Nest Account.

Note: Safety Temperatures will also be enforced when the thermostat is in OFF mode (OFF mode must be set manually by the user).