This first system (shown on the left) uses a
vertical bore hole in which a u-shaped loop, or a
coaxial loop, is placed. This pipe will act as a heat
sink in the summer when the house needs to be cooled;
allowing heat to dissipate into the ground. And,
in the winter when the house needs to be heated, the
same coil can be used to extract heat from the
ground. The second system (shown on the right)
uses a horizontal loop of coiled flexible pipe buried in
the ground. This accomplishes the same as the
vertical loop, but must be installed below the frost
line to be effective.
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