Thermostat safety temperatures

The heating Safety Temperature is on by default to prevent your home from freezing. If you have central air conditioning, the cooling Safety Temperature is off by default. You can set Safety Temperatures on your thermostat, the Nest app, or the Home app, and you'll get different options depending on your region and your system.

Note: To be able to set a Heat to Safety Temperature, your Nest thermostat must be connected to a heating system, or connected to a cooling system to set a Cool to Safety Temperature.

If the room temperature drops below or above the set Safety Temperatures, and your Nest thermostat automatically starts heating or cooling, you'll get a notification sent to your phone, as well as a message in the Nest app or an event in the Home app's Feed. Once the temperature has returned to a normal level, another notification will let you know.

Important: Notifications about Safety Temperatures rely on an active Wi-Fi and Internet connection in your home at the time of the notification. If your Wi-Fi network is down at the time when the Safety Temperature is reached, you will not receive the notification. Your thermostat will continue to heat or cool while your home Wi-Fi network is offline. Once the temperature has returned to a normal level, another notification will let you know.