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.

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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.

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• A:

The exact size of an air conditioner for an apartment varies depending on the size of the space and the layout of the apartment. A 500-square-foot room, for example, requires a 12,000 BTU air conditioner while a room with 100 square feet requires a 5,000 BTU unit.

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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."

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• A:

An air conditioner thermostat is a device which displays room temperature while working in tandem with the air conditioner. Thermostats can be used to automatically adjust the temperature in a room or to gauge temperature for manual adjustment.