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the expansion valve is a device that meters the flow of refriderant to allow for the maximum amount of cooling/humidity removal.
conradpdx, very little copper is involved in a in ground heat pump system, lots and lots of pex pipe is used for the transfer of heat from the ground to the heat pump.
i personaly have a carrier air to air heat pump, rated at a 16 on the seer rating scale and mated to a two stage variable speed 95% efficient furnace, this will be my first winter with a heat pump.
i have the controls set up to change over to the furnace at 30 degrees, air to air heat pumps are way better than they used to be. but still have a ways to go, i am experimenting at my own home, i am a heating and a/c contractor.
and as the technolgy improves we will move into the ground source heat pumps today it requires a very very large investment and so far would be a wonderful investment for the next home owner! but yes they do work
one of the troubles with converting a window unit to use as a heat pump, is what to do with the excess refriderant and installing the reversing valves and other electronic controls, a very expensive task and possible for an experianced heating person to do but with much effort.
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