Window Air Conditioners

Window air conditioners are an easy way to keep the temperature down in smaller spaces without the cost of installing and running a central air conditioner.

Total area to be cooled in square feet


Total cooling capacity measured in British thermal units (BTUs) per hour


Required electrical voltage


Models equipped with reverse cycle heating can heat as well as cool


What else should I look for when buying a room air conditioner?

Remember that bigger is not always better! Buying an air conditioner that is too large does not provide better cooling. An oversized air conditioner is actually less effective — and wastes energy at the same time. Make sure your unit is properly sized.

Properly Sized Room Air Conditioners

Many people buy an air conditioner that is too large, thinking it will provide better cooling. However, an oversized air conditioner is actually less effective — and wastes energy at the same time. Air conditioners remove both heat and humidity from the air. If the unit is too large, it will cool the room quickly, but only remove some of the humidity. This leaves the room with a damp, clammy feeling. A properly sized unit will remove humidity effectively as it cools.

To figure out which size unit is best for your cooling needs:

  1. Determine the square footage of the area to be cooled using the following formulas:
    • For square and rectangular rooms, multiply the length of the area by its width
    • For a triangular area, multiply the length of the area by the width and divide by 2
    Most rooms can be further divided into these basic shapes to determine the square footage.

    If the shape of your room is other than square or rectangular, ask your sales associate to help you determine the square footage.
  2. Using the square footage and the chart below, determine the correct cooling capacity. Cooling capacity is measured in British thermal units (BTUs) per hour.
    Area To Be Cooled (square feet) Capacity Needed (BTUs per hour)
    100 up to 150 5,000
    150 up to 250 6,000
    250 up to 300 7,000
    300 up to 350 8,000
    350 up to 400 9,000
    400 up to 450 10,000
    450 up to 550 12,000
    550 up to 700 14,000
    700 up to 1,000 18,000
    1,000 up to 1,200 21,000
    1,200 up to 1,400 23,000
    1,400 up to 1,500 24,000
    1,500 up to 2,000 30,000
    2,000 up to 2,500 34,000
  3. Make any adjustments for the following circumstances:
    • If the room is heavily shaded, reduce capacity by 10 percent.
    • If the room is very sunny, increase capacity by 10 percent.
    • If more than two people regularly occupy the room, add 600 BTUs for each additional person.
    • If the unit is used in a kitchen, increase capacity by 4,000 BTUs.
    • Consider where you install the unit. If you are mounting an air conditioner near the corner of a room, look for a unit that can send the airflow in the right direction.


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