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How to Calculate the BTU for Your Room Air Conditioner

When it comes to room air conditioners, it's important to have the proper sized unit. If you have an air conditioner that's too large for the room, it will shut off early and not have enough time to dehumidify your space. This will leave you with a cold and clammy environment. If the air conditioner is too small, it will continually run without cooling or dehumidifying the room properly, increasing your energy costs.

How do you find the right BTU size air conditioner?

Measure the square footage, which is the length multiplied by the width of the room. If it's on the main floor, multiply the square footage by 30. If it's on the second floor or in the kitchen, multiply the square footage of by 40. If your ceiling height is over eight feet, add 1,000 BTUs for every additional foot. Take into consideration the number of people in the room. For each person over the first two, add an additional 600 BTUs.


Example: You're looking for an air conditioner for a 10x15 room on the second floor with a nine foot ceiling. A 10x15 room equals 150 square feet. Since it's on the second floor, multiply 150 by 40 to get 6,000 BTUs. Since the ceiling is 9 feet, an additional 1,000 BTUs needs to be added. You'll need a 7,000 BTU air conditioner to properly cool this space.

A friendly and knowledgeable P.C. Richard & Son salesperson can help you calculate the amount of BTUs you'll need for your space. Stop by today, or shop room air conditioners now.

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