Honeywell T9 Wifi Thermostat Installation- C-wire, RTH8500D, dual sensor
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 Published On Jan 13, 2021

I replaced my Honeywell RTH8500D wifi thermostat with a Honeywell T9 wifi thermostat. I show you how to remove old one, what tools you need, how to install faceplate and how to re-wire new one.

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