Air Conditioner - Sizing

There are many factors to consider when determining the proper size air conditioner for a room. Square footage, number of occupants, is the room shaded or not, and is the air conditioner being used in a kitchen area are examples of factors that affect the size required to cool an area.

Sizing an Air Conditioner to Cool a Specific Space

For a general guideline to determine the portable or window air conditioner you will need, the chart below can be used. First calculate your room size in square feet. To calculate the room size, multiply the room length by the room width.

Min/Max Room Size	Air Conditioner Capacity
100 - 150 sq ft	5,000 BTU
150 - 250 sq ft	6,000 BTU
250 - 300 sq ft	7,000 BTU
300 - 350 sq ft	8,000 BTU
350 - 400 sq ft	9,000 BTU
400 - 450 sq ft	10,000 BTU
450 - 550 sq ft	12,000 BTU
550 - 700 sq ft	14,000 BTU
700 - 1000 sq ft	18,000 BTU
1000 - 1200 sq ft	21,000 BTU
1200 - 1400 sq ft	23,000 BTU
1400 - 1500 sq ft	24,000 BTU
1500 - 2000 sq ft	30,000 BTU
2000 - 2500 sq ft	34,000 BTU

Factors in Determining the Proper Size Air Conditioner for a Room

Once you have established a basic BTU capacity, use the following considerations to increase or decrease the BTU's needed to cool the space.

• Shaded Room: Reduce by 10%
• Sunny Room: Increase by 10%
• If the room is occupied by more than 2 people: Increase by 600 BTUs
• If cooling a kitchen area: Add 4,000 BTUs

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