Set Back Thermostat

Discussion in 'HVAC Heating & Cooling' started by BRD, Dec 11, 2009.

  1. BRD

    BRD New Member

    Joined:
    Jun 22, 2009
    Occupation:
    irrigation contractor
    Location:
    northeast
    I understand set back thermostats are a good way to save on energy costs, and are used on gas and oil heating systems. Somewhere I thought I heard or read that they were not used or recommended for heat pump installations. Is that true, and if so could you explain why? thanks
     
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    If there's a big demand for heat, rather than just trying to maintain things, that usually triggers the auxillary resistance heat to turn on. This is 2-3x or more expensive to run than the compressor alone. So, except maybe in cooling season, it's not efficient.
     
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