Safety Temperatures can protect your home during extremely cold or hot weather. With Safety Temperatures, when your home reaches a set temperature limit, your thermostat will turn on heating or cooling even if the thermostat is set to Off. This can help ensure that your pipes won't freeze or your home won't overheat.
Note: If you've connected your thermostat to a Nest Temperature Sensor, your thermostat will turn on heating or cooling according to the temperature from the active sensor.
Set 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.
On your thermostat
Note: You can only set Safety Temperatures on the thermostat if you have a Nest Learning Thermostat or Thermostat E.
How to tell which Nest thermostat you have
- Press the thermostat's display to bring up the Quick View menu.
- Select Settings
.
- Choose Safety Temp.
- Turn the ring to select the heating or cooling Safety Temperature you'd like to change and press the ring to choose it. Turn the ring to change the temperature and press the ring to confirm your change.
- Note: You can disable a Safety Temperature by turning the dial to off when choosing a temperature, but we don't recommend this since setting a Safety Temperature helps protect your home.
- Choose Done to exit the menu.
.With the Home app
- Open the Google Home app
.
- Tap Favorites
or Devices
..
- Tap and hold your device's tile
tap Settings
.
- Tap Temperature preferences
- Tap the plus or minus symbols to raise or lower the Safety Temperature. If you have both heating and cooling, you can change their temperature independently.
.
tap Settings 
.With the Nest app
- Select your thermostat.
- Tap Settings
- Tap Safety Temperature.
- Drag the sliders to your desired Safety Temperature.
Safety Temperature notifications
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 temperatures return to normal levels, 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 during 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 temperatures return to normal levels, another notification will let you know.