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Portable a\c unit

This a\c unit will not cool at all, but the compressor does cut in. The unit blow cool air out the back instead of warm air from the condensor.

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If the air doesn't seem cool enough it is necessary to use a thermometer to check the difference in temperature between the air going into the unit and the air being blown into the room. Ideally, the temperature difference should be more than 15 degrees. For example, if the temperature going into the air conditioner is 80 degrees, the temperature coming out of the unit should be at least 65 degrees or less. If the difference is 15 degrees or more there is probably no cause for concern. If the temperature difference is less than 15 degrees you should check the following:

  • Air damper


Check to make sure the air damper is closed. If it's open, it will bring in outside air and reduce the efficiency of the unit.

  • Back cover


During the winter season many people cover their air conditioners to protect the unit from the weather. In the spring or summer they will sometimes forget to remove the cover. If your unit has a cover on the outside portion of the air conditioner remove the cover first.

  • Condensing coils


The condensing coils will always be on the "warm" side of the air conditioner. That is, on the side that faces outside of the room to be cooled. Air is drawn into the back of the air conditioner on the sides through vent slots and is blown directly out through the condenser coils. If the coils get clogged with lint, dust and dirt the cooling system cannot provide the cooling necessary. To clean the coils it will be necessary to remove the entire cover of the air conditioner or pull it out of the wall to gain access to the coils. They can be cleaned by blowing compressed air at them or by using a soft bristle brush to wipe the dirt off. It is important to also clean any dirt or lint build-up in the bottom of the air conditioner so the condensate water will be picked up by the condensing fan slinger properly.

Posted on Sep 05, 2008

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  • Air Conditio... Master
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Check that AC is not set on warming first.

Posted on Sep 05, 2008

  • Ginko
    Ginko Sep 05, 2008

    If the settings are fine (AC is set on a temperature inferior to the one in the room), then inspect first the coil
    If the coil is dirty and covered with dust you will need to clean it.
    Check that the air ducts are not obstructed.
    If ducts and coil are OK then it is probably a compressor failure, you will need to recharge gas or to replace the compressor.
    See hints from the website below:



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