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

    Mar 9, 2008, 04:56 PM
    Thermostat for high effic. Furnace
    Company installed a GMV95 gas furnace, using my old Honywell thermostat, single stage.
    I believe that the 2-stage furnace needs a 2 stage thermostat. As of now the old thermostat is connected with 4 wires. If I upgrade the thermostat to a Honeywell visionpro RTH8500, won't I need an addit. 2 wires for the 2nd stage heat and A/C? Y2 and W2?
    The company says no, I need only 4 wires. Don't have to run new wiring.
    I am confused and want the new furnace to run as anticipated.
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #2

    Mar 9, 2008, 05:23 PM
    Your system can be set up to use just a single stage thermostat, the logic in the furnace control board will control high and low fire from time, not time and temp swing.
    Judoplayer's Avatar
    Judoplayer Posts: 3, Reputation: 1
    New Member
    		  
    #3

    Mar 9, 2008, 05:34 PM
    Thank you T-Top.
    Is it better to use the 2 stage thermostat? Will the system run more efficiently?
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #4

    Mar 9, 2008, 05:58 PM
    If it was me I would use the two stage thermostat so I could have a quicker response to load demand.(comfort level)
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #5

    Mar 9, 2008, 08:06 PM
    Go for the Honeywell 8000 series t-stat. There are a few different models so I would read up on them first.

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