Recommendations for a zigbee thermostat & installation

[MattB314 (Matthew Bartle)]

Wireless Thermostat Recommendation

You can use a zigbee temp sensor and relay, but also just have a simple thermostat wired in parallel with the relay. Set the thermostat to a low temperature so it normally won’t do anything, but if HA dies it will keep the house from freezing. That’s how mine is set up.