Ground water heat pumps work, even in MI or Canyada, because rather 
than relying on -20 outside air, they use ground temps, usually about 
54 degrees, and thus operate in the heat pump's efficiency range.

At 01:57 PM 5/23/2008, you wrote:


>LarryT wrote:
> >
> > Heat pumps are *very* efficient compared to oil
>
>Heat pumps are about 3x as effective as electric resistance heaters.
>This drops with evaporator temperature, by 17 degrees F the ratio
>is about 1:1 (you put in a BTU of electricity, you get out a BTU of
>heat). This is great for virtually all your heating needs in Florida,
>and still slightly useful on a sunny winter day in Michigan.
>
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Loren Faeth 


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