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  1. #1
    Join Date
    Mar 2007
    Iron Mountain, MI

    Default Dual Zone Furnace

    A furnace with two t-stats (one for the main level, and one for the lower level).

    When the t-stat is turned up for the main level the furnace operates. When the t-stat is turned up for the lower level the furnace does not kick on.

    What can be some of the reasons be for this?


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  2. #2
    Join Date
    Mar 2012
    Lansdale, PA

    Default Re: Dual Zone Furnace

    I am assuming that this is a zoned system. Did you see zone dampers? If so it could be a problem with the zone controls or the T-stat.

    I sometimes see systems with a thermostat on the first and second floor, but it is not a zoned system. With this setup the second floor T-stat controls AC and the first control heat.

  3. #3
    Join Date
    Aug 2011
    Bennett (Denver metro), Colorado

    Default Re: Dual Zone Furnace

    Recently, I was in a house with two thermostats, but one didn't do anything. After a little investigation, I realized that one wasn't wired to the furnace. Apparently the owners would rather have a dead thermostat on the wall than repair a hole in the wall.

    If the furnace isn't zoned, then you may have a similar situation.

    If you choose not to decide, you still have made a choice.


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