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Window Air Conditioner Pros and Cons

Not sure whether to buy a window- or a portable air conditioner?
Let’s first look at the advantages and disadvantages of a window unit air conditioner.

Keystone window air conditioner

  • Are more popular, thus are easier to find and price competition is in full force
  • Often have relatively low noise output and high efficiency
  • Water drains from the unit to the exterior with no intervention needed
  • Sends ALL hot air to the exterior as warm air is exchanged for cold
  • Even small units can adequately cool 100-300 square feet. Larger units can cool rooms up to 650 square feet
  • If carefully placed, can cool more than one room
  • Can be placed either in windows or wall holes


  • The window where you install the air conditioner is blocked as long as the unit is there
  • Dripping water outside can end up where you do not want it to (pedestrians on a city street? creating rust on a metal roof?)
  • More of a hassle to remove and move to another room/location
  • Not all windows support air conditioners
  • Installation can get tricky if you do not have exterior support. It is not unheard of for window units to fall out of windows at inopportune times, even during installation.
  • The panels that come with these units can let in a lot of hot air, making the air conditioner less efficient
  • Even the best installation can still leave your home or apartment at a security risk
  • Quite frankly, the appearance of many window units in a living area is not seen as the ultimate in decorating or class

Click here for the Pros and Cons of Portable Air Conditioners
Click here for Window vs. Portable Air Conditioners