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    snssimpson76's Avatar
    snssimpson76 Posts: 1, Reputation: 1
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    #1

    Sep 8, 2015, 03:30 PM
    2 into 1 thermostats
    I have 1 thermostat for furnace and 1 for ac, both only have 2 wires. Can I hook them into one programmable thermostat? The new thermostat can control both heat n ac.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Sep 8, 2015, 03:40 PM
    One issue you will have is trying to modulate 2 control boards, if so equipped. Typically there is only 1 board on a combined heat and AC unit. Sounds like you have a single stage, single speed set up. Most likely you will need more wires and piggyback them at the thermostat because you will need 2 X 24VAC for the boards. I would get the schematic for the Thermostat you wish to use and then their website for support.
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