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    meesh1902's Avatar
    meesh1902 Posts: 1, Reputation: 1
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    #1

    Oct 18, 2013, 08:26 PM
    Old 4 wire furnace no ac to it and basic 2 terminal thermostat! HELP
    I have 4 wires, red, yellow, white, green.. took off the old round thermostat because it was cracked.. it had no letters labeling the wires! I bought a Honeywell simple thermostat for heat only, it has 2 terminals W and R.. Its cold here in Chicago and I really can't afford a heating call.. HELP!
    WallyHelps's Avatar
    WallyHelps Posts: 1,018, Reputation: 136
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    #2

    Oct 22, 2013, 06:00 PM
    There is a color code for thermostat wires, and if the original installer followed that you would hook the red wire to R and the white wire to W. You only need R and W for heat.

    Hope this helps,
    WallyH
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