Honeywell alarm keypad thermostat11/21/2023 ![]() Search for the thermostat model number on your thermostat ID card for the quickest answer. Depending on the model, this number may be preceded by the letters TH, T, RTH, RCHT, CT, TL, or RLV. How To Find The Honeywell Thermostat Model Number?Įvery Honeywell thermostat model has a unique serial number that can assist you in obtaining assistance for your equipment more quickly and efficiently.
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