1 Your measurements

Type feet and inches the way you'd write them, like 12' 6" or 30 3/8. Decimals work too.

ft
ft
For an L-shaped room, use the square footage calculator then enter the total area as the length and 1 as the width.
Each person over two adds 600 BTU.

2 What size to buy

Air conditioner size
8,000 BTU
per hour · about 0.67 tons
Room
300 sq ft
chart size 8,000 BTU
Cooling power
2.3 kW
the same capacity in kilowatts
ENERGY STAR chart size8,000 BTU per hour
Size to look for8,000 BTU per hour or the nearest size above it

The chart assumes an 8 ft ceiling; for taller ceilings ask an HVAC contractor. A much bigger unit isn't better: it cools the room before it has time to pull out humidity, so the air stays clammy.

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