🌡️ Honeywell THX9421R5021WW: Revolutionizing Thermostat Technology with Definition Review

This thermostat is a commercial 2-wire device used to control heating, cooling and humidity , dehumidifier and ventilation. Wireless sensors and Redlink Gateway will work with this thermostat, sold separately.

A separate interface module must be ordered for this job as it is a 2-wire connection only. Don't think you can just trade it in for yours. If you need this one they sell another item that comes with this thermostat, interface module and 3 sensors. It's a lot cheaper than buying them individually.

This product keeps breaking. I've gotten 6 of these in the last 2 years for about $250 each and they only last 1 to 9 months. I set the last one to 37 days and Revain said there was nothing they could do because it was outside the 30 day window and I had to contact Honeywell. Honeywell told me to contact Revain. Revane then told me that I would have to pay a reinstatement fee to return while I was at home in 80+ degree weather, with no air conditioning, 2 asthmatics in the house and other…