[Strawbale] Drilled Well to Heat Greenhouse?

[Speireag Alden]

Howdy, all.

     To keep a (strawbale) greenhouse at workable
temperatures in the winter where the water table is only
twenty feet down:  what about drilling a short well and
running a loop of PEX down into it, and then pumping water
or coolant through it, and through loops in the floor of
the greenhouse?  With ground water at 50 degrees
Fahrenheit year-round, and a pump controlled by a
thermostat, the only power cost would be to run the pump.

     Cost would be about $1000 for the well, say $250 for
the pump (less if it's not brass) and electricity as
needed (which could be from a solar panel if the loops are
running through substantial thermal mass).

     What do you think?

-Speireag.

-- 
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