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    dougdstecklein's Avatar
    dougdstecklein Posts: 2, Reputation: 1
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    #1

    Jan 29, 2009, 01:44 PM
    Heat pumps and minimum outdoor temperature
    I had a heat pump installed a few months ago. The installer set the auxillery heat to take over at 25 degrees. The heat pump has no problem heating my house at this temperature, but I am worried that it is less efficient at these low temperatures than my gas furnace. My worry is not about the money. It is the amount of carbon released. I think my furnace is 78% efficient and the heat pump is 13 seer and hspf 8.5.

    Is my heat pump more or less efficient at 25 degrees than my furnace?
    dougdstecklein's Avatar
    dougdstecklein Posts: 2, Reputation: 1
    New Member
    		  
    #2

    Jan 29, 2009, 02:23 PM
    Quote Originally Posted by dougdstecklein View Post
    The installer set the auxillery heat to take over at 25 degrees.
    I think I should have said the gas furnace not auxillery heat takes over at 25 degrees.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    Jan 29, 2009, 07:49 PM
    My worry is not about the money. It is the amount of carbon released

    If you are that worried about the carbon release then I would invest in a 95 to 98% efficient furnace and shut off the heat pump at a higher temperature. The smoke stack power plants that generate electric are the main problem. Now if you live in a area with hydro electric or a nuke generating the power you are in good shape.
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