Window Air Conditioner Repair, Sale and Installation in Manhattan, New York, NY.

If you have a small area to cool in the summer - say, one or two rooms a room air conditioner may be a more economical choice than a central air conditioning unit It will cost less initially and it will cost less to operate in the long run.

Most room air conditioners sit in a window where they can exhaust warm air to the outside. Window installations can be drafty, however, so at the end of the warm weather season some people remove the unit from the window and store it for the winter. Window air conditioners can also be built into the wall for a more permanent installation.

Keep in mind that, when choosing a room air conditioner, size is important. A unit that is too small will run continually without cooling the room effectively. On the other hand, if you buy a unit that's too large for the space you're cooling, it actually will be less effective than one that's the correct size. Bigger isn't necessarily better.

Air conditioners work by removing both heat and humidity. Humidity condenses from the air when it passes over the air conditioner's cooling coils. So a unit that is too big will cool the room so quickly that it won't have the opportunity to remove as much humidity from the air as it should. As a result, the unit will keep turning off and on and the room will feel damp, clammy and less comfortable. A properly sized unit, on the other hand, will remove humidity effectively as it cools.

Also remember that larger units cost more and use additional energy. Running a smaller unit for a longer period of time will use less energy to completely cool a room than running a larger unit for a shorter time.


The cooling capacity of room air conditioners is measured in BTU per hour.

To figure the size unit you need, measure the space you're trying to cool and find it on this chart. To estimate square footage, multiply the length of the room by the width. (A room that's 10 feet by 20 feet, for example, has 200 square feet in it. The chart shows the recommended air conditioner for that sized space is rated at 6,000 BTUs.)

To cool this area Look for this size air conditioner

100 to 150 square feet5,000 BTUs

150 to 250 square feet6,000 BTUs

250 to 300 square feet7,000 BTUs

300 to 350 square feet8,000 BTUs

350 to 400 square feet9,000 BTUs

400 to 450 square feet10,000 BTUs

450 to 550 square feet12,000 BTUs

550 to 700 square feet14,000 BTUs

700 to 1,000 square feet18,000 BTUs

1,000 to 1 400 square feet24,000 BTUs

When looking for the correct size air conditioner, keep these suggestions in mind, as well:

  • If the room is heavily shaded, you can reduce the BTU capacity by 10%

  • If the room is very sunny, you should increase the BTU capacity by 10%

  • If more than 2 people regularly occupy the room, add 600 Btu for each additional person

  • If the unit is for a kitchen, increase the capacity by 4,000 Btu/Hr.

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