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  1. #1
    Join Date
    May 2009
    Posts
    10

    Heating effiency of a 15 SEER heat pump?

    Is there a conversion from the SEER rating of a heat pump to a percentage heating efficiency?

    I know that electric resistance heat is 100% efficient and that heat pumps are > 100% efficient.

    How can I determine the heating efficiency of my 15 SEER Trane heat pump?

    Is it approx. 150%?

    Thanks!

    Bill

  2. #2
    Join Date
    Nov 2000
    Location
    Upstate, SC
    Posts
    2,920
    SEER is the cooling rating and HSPF is the heating rating.

  3. #3
    Join Date
    Oct 2003
    Location
    Washington
    Posts
    7,405
    Quote Originally Posted by Bill NC View Post
    Is there a conversion from the SEER rating of a heat pump to a percentage heating efficiency?

    I know that electric resistance heat is 100% efficient and that heat pumps are > 100% efficient.

    How can I determine the heating efficiency of my 15 SEER Trane heat pump?

    Is it approx. 150%?

    Thanks!

    Bill
    Efficiency and operating costs are 2 different animals. This is a chart that my local utility company puts out. Gives you an idea:
    Attached Images Attached Images

  4. #4
    Join Date
    Feb 2010
    Location
    Cal
    Posts
    1,596

  5. #5
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,613
    COP compares a heat pump to straight resistance. Measured at 2 outdoor temp points, 47 and 17. As Bobby said, the industry has pretty much changed to look at HSPF. That's BTUs per watt averaged over the heating season like SEER. Minimum is 7.7, takes 8.5 to get the tax credit, some 10 as the top point.

    But on COP, at 47 you may be around 3.5 and at 17 probably 2.5 so you can compare to electric heat. Back in the 70s a pump might turn in 2.4 at 47 and 1.3 at 17.

  6. #6
    Join Date
    Jun 2007
    Location
    The Twilight Zone
    Posts
    2,964
    Quote Originally Posted by Bill NC View Post
    How can I determine the heating efficiency of my 15 SEER Trane heat pump?
    Get the technical operating data from Trane.

    It should show C.O.P. (Coefficient of Performance) over a range of ambient temps. As ambient temps drop, C.O.P. also drops.

    Goodman has outstanding technical operating data for their heat pumps on their website. For other mfrs, a home owner trying to get tech data is like pulling teeth.

    Take care.

  7. #7
    Join Date
    May 2007
    Location
    Dry as a bone Tucson
    Posts
    4,544

    comp chart

    Quote Originally Posted by seatonheating View Post
    Efficiency and operating costs are 2 different animals. This is a chart that my local utility company puts out. Gives you an idea:

    Thanks for the comp chart. Very informative
    Some Talk, Some Do
    Energy efficient and economical to operate are not synonyms
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