2 Stage Thermostat With Old Wiring (4 Wires)? - HVAC - DIY Chatroom Home Improvement Forum

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Old 06-21-2010, 10:27 PM   #1
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2 stage thermostat with old wiring (4 wires)?

I have the furnace and a/c replaced in my 20+ year old house. Because the furnace is 2 stage, the sales guy agreed to give me a 2 stage thermostat upgrade for free. However, the tech guy came today and told me that even they give me a 2 stage thermostat, it's useless because the old wiring only has 4 wires, while the 2 stage thermostat requires 5 (or 6?) wires to make it useful. To rewire they would have to cut through the walls, which would cost me a lot more.

Is this true? Is there any workaround?



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Old 06-22-2010, 05:41 AM   #2
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Honeywell IAQ thermostat. Only requires 3 wires to the thermostat.


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Old 06-22-2010, 12:34 PM   #3
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...call the sales guy up and tell him you owe me the wire PULL to connect the FREE stat you gave me with the replacement of my old equipment...he missed it should of popped the stat off and saw the wires terminals and added it to the new istall ...and they don't have to run it where the old wire pull is any HVAC guy with a imagination can get that new wire pull in with no problem...tech probably didn't care for the sales guy but the company is looking bad overall...ring the owner up see that reaction in throwing up the price of the total equipment sold to you...
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