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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.
To figure out which size unit is best for your cooling needs:
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.
Using the square footage and the chart below, determine the correct cooling capacity. Cooling capacity is measured in British thermal units (BTUs) per hour.

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