Why not mount the outside AC/HP unit in my basement?
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  1. #1
    Join Date
    Dec 2007
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    Overlook PA
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    Why not mount the outside AC/HP unit in my basement?

    I have an air-source heat pump with all ductwork in the basement. I live in central Pennsylvania. In the summer, if outside temperatures are 85 degrees-100 degrees I want to cool the house to 75 degrees. I have a full underground basement (about 1800 sf) that stays around 65-80 degrees. If my outside HP/AC coils were in the basement (and I had a cold air inlet in the basement) my HP/AC would do much less work, use less electricity and maybe even need a smaller unit than an outside one. Basically going from 65-80 basement degrees to 75 degrees instead of 85-100 outside degrees to 75 degrees.

    Same deal for heating in the winter. Outside temps 0-70 degrees outside and 40-60 degrees in basement. Basically going from 40-60 basement degrees to 70 degrees instead of 0-70 outside degrees to 70 degrees. Much less work for the HP.

    Where is my logic wrong? What are the problems with doing this (if a professional would actually install it I'm eventually going to need to replace my 18 year-out heat pump and with the rising price of all energy, I thought placing it in the basement could save electricity/heating/cooling costs and initial installation of a smaller unit.
    Thanks in advance!
    Tim

  2. #2
    Join Date
    Dec 2006
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    Middle Tennessee
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    Quote Originally Posted by tkat17 View Post
    I have an air-source heat pump with all ductwork in the basement. I live in central Pennsylvania. In the summer, if outside temperatures are 85 degrees-100 degrees I want to cool the house to 75 degrees. I have a full underground basement (about 1800 sf) that stays around 65-80 degrees. If my outside HP/AC coils were in the basement (and I had a cold air inlet in the basement) my HP/AC would do much less work, use less electricity and maybe even need a smaller unit than an outside one. Basically going from 65-80 basement degrees to 75 degrees instead of 85-100 outside degrees to 75 degrees.

    Same deal for heating in the winter. Outside temps 0-70 degrees outside and 40-60 degrees in basement. Basically going from 40-60 basement degrees to 70 degrees instead of 0-70 outside degrees to 70 degrees. Much less work for the HP.

    Where is my logic wrong? What are the problems with doing this (if a professional would actually install it I'm eventually going to need to replace my 18 year-out heat pump and with the rising price of all energy, I thought placing it in the basement could save electricity/heating/cooling costs and initial installation of a smaller unit.
    Thanks in advance!
    Tim
    you would have to put a slew of outlets in the basement and if you did not;

    in the summer it will end up getting hot in the basement!

    in the winter it will end up getting cold in the basement!

    .

  3. #3
    Join Date
    Jan 2004
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    Lancaster PA
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    67,699
    Your outdoor unit would over heat your basement.
    Your outdoor unit is rejecting the heat from the entire house, one supply won't do a thing for the basement if the outdoor unit was installed in it.
    You would need a second larger A/C for the basement then.
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  4. #4
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    Feb 2004
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    chicago suburbs
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    nothing wrong at all.......be sure to take some pics.
    FILL OUT YOUR PROFILE!!

  5. #5
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    Quote Originally Posted by tinner73 View Post
    nothing wrong at all.......be sure to take some pics.
    LOL..
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  6. #6
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    Quote Originally Posted by beenthere View Post
    You would need a second larger A/C for the basement then.
    and then another one for that one, and so on, and so on



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  7. #7
    Join Date
    Feb 2008
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    Western NC
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    Heat pump in basement........hmmmmmmm

    well for one a heat pump is designed to transfer heat from one location to another. which means all the heat pulled from the home will be dumped into the basement. And since here in the good ole USA, heat rises, where do you think it will end up?????

    secondly, a heat pump in heat mode will move all the cold air to the basement. Not to mention it will flood your basement with the condensation forming.


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  8. #8
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    Apr 2008
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    Did Rip 1 out of a ceiling

    Got a call at the university of Alberta, they needed server room A/C replaced. So when I went to bid on the job found samsung hanging from chains above ceiling tiles just recirculating air. Lasted 2 years. They wanted me to put it back in same place. Told them no warranty. They let me put it on roof. Cost them a little bit more with low ambient kit and roofer.
    Do it right the first time.

  9. #9
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    Quote Originally Posted by 21degrees View Post
    Got a call at the university of Alberta, they needed server room A/C replaced. So when I went to bid on the job found samsung hanging from chains above ceiling tiles just recirculating air. Lasted 2 years. They wanted me to put it back in same place. Told them no warranty. They let me put it on roof. Cost them a little bit more with low ambient kit and roofer.
    I think we need a new title for mr 21degrees......

    Professional Hijacker

    haha j/k good story though
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    If you don't know, then don't do. If you don't know and still do, then be prepared to pay someone else a lot to undo what you did and then do it right.

    If you do know, then do. But do it right. Otherwise, you may not be doing it long.

  10. #10
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    They were pissed at me

    This winter it was -42 * c and unit would not work with kit was only rated for -30*c. Who in the hell would have expected it to get that cold. Lost contract due to that. I was on a cruise ship and my guys could'nt get it going, so I called in another company.
    Do it right the first time.

  11. #11
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    Quote Originally Posted by 21degrees View Post
    Got a call at the university of Alberta, they needed server room A/C replaced. So when I went to bid on the job found samsung hanging from chains above ceiling tiles just recirculating air. Lasted 2 years. They wanted me to put it back in same place. Told them no warranty. They let me put it on roof. Cost them a little bit more with low ambient kit and roofer.

    i seen a couple of minimates set-up like that (exhausting hot air into ceiling) they worked fine for many years!



    .

  12. #12
    Join Date
    Aug 2003
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    466
    Even with enough cross ventilation from the outside and a good condensate removal system, the most that would be gained is from keeping the unit out of the elements. There are many instances where heat pumps and condensers are located inside of large buildings with offices built within them. The same basic reasoning is present.

    Once the cross ventillation were enough to handle the heat transfer to prevent the heat removal/gain from the heat pump from recirculating through the system, your basement would essentially be the same temperatures as the outdoors.

    While the unit may not be exposed to the elements, such as heat from the sun or possible snow/ice build up from snowy or sleeting days, the unit would also not benefit from being washed off by the rain. Still, there are points to ponder on this one.

  13. #13
    Join Date
    Sep 2004
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    219
    yeah, yeah, take lots of pictures and post them directly to the "wall of shame". That will be exactly where they belong. Is that idea anything like perpetual motion? Getting something for nothing? Just leave the condensing unit where it is and turn on the sprinkler next to it on hot/cold days.

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