Quote:
Originally Posted by AC_Hacker
Also, I notice that you seem to be thinking of one heat pump that performs multiple functions. Have you considered multiple small pumps each tune......
-AC_Hacker
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I personally like this idea AC hacker. I too have noticed the higher cop of the smaller units and this thought has crossed my mind. We are looking at using a gshp primarily for summer cooling in the house but out in the shop I have 2500 sq. Ft. That I like to keep above freezing in the winter. The slab was poored with pex before we bought the property but it has 4 zones within it, and the idea of 4 small diy heat pumps running very efficiently as opposed to one large one working over time is very attractive.
As a side note....
I have recently with my few moments if spare time started to construct some ground probes of various length. They are simply various lengths of 3/4" water pipe I plan to drive into the ground in a progressive manner starting at 4 feet and by the foot down to 12 feet. I plan to use a trench and slinky coil method for the 3 tons worth of cooling ( only need 2 but one extra won't hurt) and the 4 for the shop. I have access to a back hoe that can dig to 14 feet with a 4 foot wide bucket so that's the digging plan. I talked to a local gshp contractor the other day and he recommended 600' at 7' depth minimum per ton for trench and my soil. Large rocks and red clay. I also live at the bottom of a large hill from the glacial period that provides artisan water wells for all the farmers and the water table is as shallow as 4 feet in some places so I think by chance we hit the jack pot with our choice if home.