Geoexchange heat pump system on small suburban lot

Discussion in 'Vertical and Horizontal Loops' started by pachai, Jun 18, 2010.

  1. pachai

    pachai New Member

    I'm preparing to remodel my house, and I was thinking
    it would be a good time to consider a GSHP.

    My house is 2.5 stories on a 600 SF footpring
    (i.e., 4 levels, 2400 SF). I am considering adding
    300 SF on 4 levels, for a total of 3600 SF.

    My property is just 5000 Square feet.

    I was thinking that I will be digging a hole 14' x 25', 6 feet deep.
    Would it make sense to plan on digging deeper, and put a closed
    loop under the slab?. It should cost half as much
    to dig this deep as to start from the grass and dig down.
    Can they be laid in layers? or paralleled about 1' apart?
    how about in layers? Dig down 9', put in loops, fill 3', put in more.

    It seems the risk is that a problem would cost a fortune to fix,
    because it is under 2' of concrete.

    Also looking for references or installers in
    Northern NJ or NY Metro area.

    userid: my name at nevjersey dot org
  2. Palace GeoThermal

    Palace GeoThermal Well-Known Member Industry Professional Forum Leader

    loops under basements are not recommended. Look at the IGSHPA site. to find an installer.
  3. benjie

    benjie New Member

    If you get a contractor who understands GeoThermal installs, he will tell you how far down each hole goes and how far apart they are. My 1700 sq ft house required 2 450FT holes for a closed loop system. I would say the holes were about 30 ft apart.

    I'm on a 1/3 of an acre. Very tight.
    Had it done last year. Couldn't be more happier on the outcome.

    Good luck
  4. urthbuoy

    urthbuoy Well-Known Member Industry Professional Forum Leader

    Engineered backfill

    The costs associated with engineered backfilling to your required house grade will defeat any economic gains in this manner. Drilling may be the best option, and this is a beneath foundation option as well.
  5. engineer

    engineer Well-Known Member Industry Professional Forum Leader

    It is hard to imagine anything other than a vertical loops working for this site

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