Air Conditioner Size Requirements

Air conditioners are measured in British Thermal Units (BTU), which measures the cooling capacity of the unit. Selecting the correct size unit for the room depends foremost on the room size. In addition, you must consider what the room is, the location of the room, and how many people will be in the room when the air conditioner is being used.

Size the area that you need to cool by measuring the width and the length of the area. Multiply the width and length to determine the square footage of the room. She just cut her electricity bill to 60%, click here to read. When you look for the correct size air conditioner, you look for a unit that has the cooling capacity to effectively and efficiently cool the area. Generally, 8,000 BTU is needed for every 300 square feet, but other factors need to be taken into consideration.

If the unit is needed for a kitchen, you need to add 4,000 BTUs to the total BTUs needed for the square footage. This is because the kitchen generally has a lot of appliances running, which all add heat to the room. If the square footage requires an 8,000 BTU air conditioner, add 4,000 BTUs to that total, which will be 12,000 BTU.

Air conditioner BTUs are stated assuming that there will be two people in the room. If you will have more than two people in the room any time during the operation of the unit, add 600 BTU for each additional person. If you will have four people in the room while the unit is running, you would add 1,200 BTU to the total amount needed for the square footage plus any other calculations.

Rooms that are on the north or east side of the building generally have more shade during the day. In these rooms, you can subtract 10 percent from the total BTUs needed to cool the area. If the room is on the south or west side of the house (which is sunnier), add 10 percent to the total BTUs needed. For example, if you need 8,000 BTU for the square footage, you add 10 percent (800 BTU) for shaded rooms and subtract 800 BTU for sunny rooms.

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