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    DIY's Avatar
    DIY Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Jun 17, 2007, 09:30 AM
    Thermostat wire
    When I run the thermostat wire for my 2-stage furnace and AC (which I just learned needs an 8-wire line), do I have to worry about wire gauge and wire length? For example, my furnace installation instructions indicate a 24 gauge wire needs 25 feet, an 18 gauge wire would need 110 feet. The furnace is--a straight line distance--maybe 10-12 feet from where I want to put the thermostat. 25 feet of 24 gauge will work for this application?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jun 17, 2007, 10:27 AM
    Yes it will work BUT I would never run that thin of a wire for my control circuits. All we use here is 18 minimum. The cost difference is little or nothing compared to the potential problems with a thinner wire.
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