cold side, consisting of the
expansion valve and the cold coil,
is generally placed into a furnace
or some other air handler. The air
handler blows air through the coil
and routes the air throughout the
building using a series of ducts.
The hot side, known as the
condensing unit, lives outside the
building. In most home
the unit looks something like this:
unit consists of a long, spiral coil
shaped like a cylinder. Inside the
coil is a fan, to blow air through
the coil, along with a
weather-resistant compressor and
some control logic. This approach
has evolved over the years because
it is low-cost, and also because it
normally results in reduced noise
inside the house (at the expense of
increased noise outside the house).
Besides the fact that the hot and
cold sides are split apart and the
capacity is higher (making the coils
and compressor larger), there is no
difference between a split-system
and a window air conditioner.
warehouses, businesses, malls, large
department stores, etc., the
condensing unit normally lives on
the roof and can be quite massive.
Alternatively, there may be many
smaller units on the roof, each
attached inside to a small air
handler that cools a specific zone
in the building.