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-   -   2 Thermostats on one furnace (https://www.askmehelpdesk.com/showthread.php?t=20203)

  • Feb 9, 2006, 11:44 AM
    qfowers
    2 Thermostats on one furnace
    I would like to add a downstairs thermostat on my furnace. Will it hurt my electronic/programmable thermostat upstairs to simply wire another thermostat to the furnace? I understand the voltage would be sent back to it but it wouldn't go anywhere that it doesn't already when the upstairs thermostat kicks on. I was told it for sure wouldn't hurt the old dial thermostats but want to check and see if I am going to kill my programmable one. Any info on this would be appreciated.
  • Feb 9, 2006, 11:54 AM
    labman
    Such an arrangement would apply voltage to the W terminal of the thermostat when it wasn't calling for it. If the thermostat actually has small relays in it, it shouldn't hurt anything. If instead, it is solid state, I can't say. Might be a good idea to carefully read the instructions and maybe check with the manufacturer.
  • Feb 9, 2006, 02:00 PM
    qfowers
    The thermostat makes a loud click when it kicks on and is at least 10 years old so I would assume it has relays. I think I will give it a shot. Thanks for the info.
  • Mar 1, 2007, 03:03 PM
    TKellertck
    Quote:

    Originally Posted by qfowers
    I would like to add a downstairs thermostat on my furnace. Will it hurt my electronic/programmable thermostat upstairs to simply wire another thermostat to the furnace? I understand the voltage would be sent back to it but it wouldn't go anywhere that it doesn't already when the upstairs thermostat kicks on. I was told it for sure wouldn't hurt the old dial thermostats but want to check and see if I am going to kill my programmable one. Any info on this would be appreciated.

    Many Programmable stats have a remote sensor opption.They are a 2 wire S1 & S2 simple hook-up.You may need to disable the main sensor for set up to work properly.
  • Mar 1, 2007, 04:16 PM
    NorthernHeat
    I don't see where this would help you. You will just end up overheating the area with the least heat demand. Pretty much just like the problem you are trying to resolve.
  • Mar 5, 2007, 08:27 PM
    jake4
    If possible you need a zoning system installed, aprilaire makes nice setup
  • Mar 5, 2007, 08:42 PM
    NorthernHeat
    Quote:

    Originally Posted by jake4
    if possible you need a zoning system installed, aprilaire makes nice setup

    Sounds like a better plan, but still not easy to retrofit and make work good.

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