Q:

# What size air conditioner do I need for a 12 x 15 room?

A:

An air conditioner suitable for a 12 by 15 room has a minimum cooling capacity of 4500 BTU. Estimate this by multiplying the area of the room by a constant: 25 BTU. Therefore, 12 x 15 = 180 square feet. When 180 is multiplied by 25, the result is 4500.

Know More

If a smaller air conditioning unit is used, it is going to run often and use a great deal of electricity. Even so, it is not likely to cool the room sufficiently. However, if an air conditioner is too large, it only does half of its job. As the appliance makes a room cooler, it also removes moisture from the air. A large air conditioner in a small room does not need to run very long, so too much moisture remains. This makes the cooler air feel humid or clammy.

## Related Questions

• A:

To effectively cool a room, it is necessary to have an air conditioner with the correct capacity. To cool a 435-square-foot room, a 10,000-BTU air conditioner is needed.

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• A:

To figure out the size of air conditioner that is needed for a space, the square footage needs to be established so that the cooling capacity can be determined. It is important that the air conditioner is not too small or too large for an area as either of these can waste energy.

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• A:

The hourly operating cost for a 12,000 BTU air conditioner depends on factors such as the unit’s Energy Efficiency Ratio, "EER," or Seasonal Energy Efficiency Ratio, "SEER," room or house size and local energy rates. As of 2014, the average cost for energy is nearly 13 cents per kilowatt-hour, "kWh."