Air-Source, Ground-Source, and Absorption Heat Pumps By now,
you've learned that air-source heat pumps use an outdoor fan to
bring air over refrigerant-filled coils. Two sets of these coils
transfer this heat indoors, where it's then blown away from the
coils by a second fan, and distributed through your home as cool
goodness. Some air-source heat pump systems consist of a single
packaged unit containing both sets of coils in one box. This box
is then installed on the roof of a building with the ductwork
extending through the wall. You'll see a lot of larger systems
for commercial buildings installed in this way. Home heat pumps
are usually split systems with an outdoor and an indoor
component installed through the wall. Depending on the type of
system, there may be one or more indoor components to distribute
heat. Ground-source heat pumps are a little different. They
absorb heat from the ground or an underground body of water and
transfer it indoors, or vice versa. The most common type of
ground-source heat