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What Size Do I Purchase?
Proper sizing is very important for efficient air conditioning.
A bigger unit is not necessarily better because a unit that
is too large will not cool or heat an area uniformly. A small unit
running for an extended period operates more efficiently and
is more effective at dehumidifying and comfort than a large unit that
cycles on and off too frequently.
Based on size alone, an
air conditioner generally needs 20 Btu for each square foot
of living space.
Based on size alone, an heater generally needs 45 Btu for each square foot
of living space.
Other important factors to consider when
selecting an air conditioner or heater are room height, local climate,
shading, window size, etc. This is calculated by using manual
"J" for proper sizing.
Verify that your home's electrical system can meet the unit's
power requirements. The average need is between 30 and 50 amps. This
depends on size of home and what seer unit. The higher seer needs less.
See Also:
Calculate the Size of Room Air Conditioner
You Need
Tips for Reducing
the Energy Cost of a Room A/C
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