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Aoshal
Community Member
since ‎11-23-2022
‎12-06-2022

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Replacing Honeywell THX9421R5021WW with a Nest learning thermostat

11-23-2022
  Hello,I am trying to replace my Honeywell THX9421R5021WW with a Nest learning thermostat. My old unit controls gas furnace (heat) forced air AC and humidifier. I only have two wires connected to the Honeywell thermostat (R and C). How do I connect ...