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  1. #1
    Join Date
    Oct 2005
    Posts
    40
    We have a heat pump system and last night the temps got down to about 34degrees. The tstat was set at 72 and the air coming out of the register was 87 degrees. Is that a pretty good reading from the register when the temps are down to 34?

  2. #2
    Join Date
    Oct 2006
    Location
    The Beach
    Posts
    718
    Should have been close to 92 degrees. In case the strips come on it would be above 100 degrees.

    Make sure the filter is clean and all the supply grills are open. If it is a split system the out door or in door coil might need to be cleaned. If a package unit check the coil.
    Blue Fox

  3. #3
    Join Date
    Oct 2005
    Posts
    40
    Should it still be 92 degrees at the register if its only 34 outside?

  4. #4
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,244
    Depends upon airflow and the equipment. And where you are reading. Accurate way is right over the air handler, not at registers.

    With normal 400 CFM/ton, I'd have expected a bit more. With a scroll I'd expect more like 25 rise, maybe 20 with a recip.

  5. #5
    Join Date
    Sep 2002
    Location
    I don't know
    Posts
    2,903
    Originally posted by BaldLoonie
    Depends upon airflow and the equipment. And where you are reading. Accurate way is right over the air handler, not at registers.

    With normal 400 CFM/ton, I'd have expected a bit more. With a scroll I'd expect more like 25 rise, maybe 20 with a recip.
    Is there a logical reason why scrolls heat better than recips? If compressor is rated at x BTUs/Hr @ specific conditions, it shouldn't matter what type it is.

  6. #6
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,244
    I have heard a technical explanation why this is but it was way over my head. Maybe Norm or someone else could explain it.

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