Selecting The Correct Room Air Conditioner BTU Size
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The room air conditioner BTU sizing
chart shown below offers an
accurate estimate for cooling needs
under most situations.

The drawback to sizing charts is they
don't take into account many of the
variables  that affect overall
performance.

One of the variables that affect the
performance of a room AC is
geographic location.
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For instance, an 8 or 9,000 Btu air conditioner would provide sufficient cooling for a
400 sf. room in Bangor Maine. But to cool the same sized room in muggy Miami, you
might want to consider an AC in the 10 to 12,000 Btu range.

Up-sizing might also be necessary for a family room frequented by multiple occupants
(people add heat), the kitchen, or south facing rooms.

Room air conditioners with the Energy Star label will consume less electricity than
unrated models. An EER (Energy Efficiency Rating) of 10 or more is very good.

Although room air conditioners with higher efficiency ratings are marginally more
expensive they'll cost less to operate in the long term. Also, many Energy Star rated
room air conditioners qualify for rebates from local utility companies.
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Room Air Conditioner Sizing Chart
Window Units
Square Feet
BTU's
100 - 150
5,000
150 - 250
6,000
250 - 300
7,000
300 - 350
8,000
350 - 400
9,000
400 - 450
10,000
450 - 550
12,000
500 - 700
14,000
700 - 1000
18,000