Google Nest Thermostat vs Honeywell Home T9 Smart Thermostat

The Honeywell Home T9 Smart Thermostat, when rooms disagree. It includes a remote sensor, a 2 year warranty, a system health monitor and full Home Assistant support. The Google Nest Thermostat fits a single location that already has a C-wire, with 5 GHz Wi-Fi and no remote sensor to manage.

No. The Google Nest Thermostat does not support external temperature sensors. The Honeywell Home T9 Smart Thermostat includes a Smart Room Sensor and can use occupancy so the system follows the room people are in.

Room sensing. The Honeywell Home T9 Smart Thermostat is built around sensors away from the wall. The Google Nest Thermostat uses sensors on the unit itself, including ambient light, which the T9 does not list, and it adds 5 GHz Wi-Fi.

Yes. The Google Nest Thermostat and the Honeywell Home T9 Smart Thermostat both list Apple Home, Alexa, Google Home and SmartThings. Neither supports Matter. Home Assistant is partial on the Nest and supported on the T9.

Anyone whose real problem is a hot upstairs or a cold bedroom, who wants a sensor in the box and a 2 year warranty. Plan on the Resideo app, and know it is not for electric baseboard heat.

Anyone who wants a compact thermostat with weather on the display, automatic scheduling and 5 GHz Wi-Fi, and whose HVAC already has a C-wire. It will not balance a second room with a remote sensor.