We designed and installed a pv system several years ago that included a water source heat pump. Actually two heat pumps, one on the grid for most of a small home, and a smaller unit for just the master bedroom-bath. It worked ok but only because it was a very small house with only one elderly occupant, and had a pot load of solar modules and batteries.

I think a small propane fired chiller that uses radiation coils exposed at the ceiling is the only way to go if you are talking off grid that requires some cooling. Since there is only a small chilled water circulating pump and no energy hog fans and ductwork, this is the most cooling you can get for the least electrical power. For low energy heating you can't beat hot water floor radiation!

Also, we are re-visiting the 1930's technology again of using desiccant materials to absorb moisture from air and solar thermal panels for heat of rejection to "re-charge" the moisture removing materials. For our part of the country, summer means constant very high humidity where swamp coolers are useless.

Jeff Yago

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