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 Room Air Conditioner 

 Always, always, always measure your window and make note of which way it opens...up and down...or side to side. Is there any hydro close to the window that you would like to install a air conditioner?? Over sizing a air conditioner will not make the room colder !!  Walls, hall ways and door ways will slow down the cold air from circulating around into other rooms.

Model and serial number locator

When was the first Air conditioner invented for home use or industrial?

What size air conditioner to buy?
Area in
square feet
100 to 150 5,000
150 to 250 6,000
250 to 350 7,000
350 to 400 9,000
400 to 450 10,000
450 to 550 12,000
550 to 700 14,000
700 to 1,000 18,000


  • My room ac does not cool. Part 1
    Have you had it cleaned? The back coil (condenser) and front coil (evaporator) needs to be cleaned every year. Some places even 6 months. If you have a build up of dust and algae, this will cause your compressor to overheat and cause poor cooling. Please make sure you clean out the condenser and your front coil for proper cooling. Use a degreaser to help eliminate the build up with a spray nozzle. Start by blowing from the outside in. Please remove AC from your home and wash outside for proper cleaning.
  • My room ac does not cool. Part 2 But I think some Freon will do the trick.
    You could have a leak in the system. If you hear the fan blowing, and the compressor on, then there might be a sealed system leak. At this point you need to call a qualified technician. You cannot just add Freon to an AC. You must find a leak. The system is completely sealed. If it is low then there is a defect and needs to be corrected.
  • My room AC make a noise when it starts.
    Most of the time this is normal. The compressor internal valve will sometimes rattle on start up till the oil is moving. You might just want to live with it. Because the only solution is to replace it. Also you may look to see if you have any copper lines to close to your compressor or the cabinet it pushes into.
  • My Room AC fan motor is squealing.
    Only certain models have oil ports on the top of the motors. Check to see if you have two on your model by looking at the top of the motor and seeing some yellow tabs. If so pull them out and use some small motor oil. If not, the only thing you can do is replace the motor.
  • My Room Ac leaks water out the front.
    Goes back to question 1. Your AC needs to be cleaned every year. You may have a build up of algae in your evaporator (front coil) not allowing water to drain from your front to back. You may also have not enough tilt to your ac. It must have some tilt to drain the water to the rear. Pour some diluted bleach in your front trough to remove some algae. Refer to question one for more information.