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Discussion Starter #1
i have a honeywell thermostat,hooking it up in the garage,i have a black&red wire which letter does the black wire go to
 

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What letters are availabe on the thermostat? Is this for heating and air conditioning? Which type of thermostat do you have? Is a low voltage or a line voltage system? Can't really advise you unless you provide more informaton.
 

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Master Electrician
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If it’s low volt, heat only…one of the colors to ‘R’ both at the stat and the furnace, the other to ‘W’ at stat and furnace. As Missouri said, more info is really needed.
 
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