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    jtruhon's Avatar
    jtruhon Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Mar 5, 2007, 08:43 AM
    To buy and install a 3 wire programmable thermostat for Heat and A/C
    Where can I purchase a 3 wire programmable thermostat for Heat and A/C?

    Is there any thing special I need to know about the installation?

    Thanks
    Joe
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #2

    Mar 5, 2007, 08:51 AM
    Home Depot or Lowe's are great places to start. All heat a/c units I've worked on had 4 wire stats, not three.
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member
    		  
    #3

    Mar 5, 2007, 09:26 AM
    Most thermostats have 4-5 contacts. Any one that doesn't need a com wire for power should work fine, you just won't have the fan On option. If your current thermostat has wires to R, W, and Y, just transfer them to the same terminals on the new one. More questions? Check the sticky at the top of the forum.
    Bullbaker's Avatar
    Bullbaker Posts: 1, Reputation: 1
    New Member
    		  
    #4

    May 22, 2010, 11:38 AM
    My old thermostats has five (5) wire r, w, y, g, and b. my new thermostats has four (4) r, w, y, g. what do I do with the blue wire...


    Thank you Ronnie
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
    Ultra Member
    		  
    #5

    May 22, 2010, 11:40 AM

    Put it on c
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