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Cooling and Ventilation Systems Category:

Portable  Room Air Conditioners / Window Air Conditioners


Portable room air conditioner / window air conditioner does not blow cool air.

Tools / Materials (See Below for Applicability):

  • Screwdriver (or other fastening device as determined by the manufacturer's use of fasteners)

  • Scrubber brush

  • Vacuum

  • Dampened cloth/rag

  • Garden hose (to be used outside for cleaning purposes)

  • Replacement filter

  • Motor lubricant oil (see manufacturer's instruction manual)

  • Manufacturer's instruction manual for the portable room air conditioner / window air conditioner



If your portable room air conditioner / window air conditioner does not blow cool air, you may need a licensed AC technician to recharge it with refrigerant (aka, Freon® by DuPont)However, there may be other causes of an air conditioner's failure to blow cool air that you may resolve on your own

Caution: When dealing with any device that requires electrical power, make sure you take precautions before you work on it, including disconnecting the power.

If your portable room air conditioner / window air conditioner does not blow cool air, do the following:

  1. Unplug the cord of the air conditioner and place it in a cleared working area, preferably outdoors (if attached to the window, because of its heavy load, two people should carefully remove the air conditioner and set it down in the working area).

  2. Having set it in the working area, as may be applicable, using a screwdriver or other fastening device that is appropriate, unscrew/unfasten and remove the grille cover, the filter that is found underneath the grille, and any metal covering to get better access to the air conditioner coils and fins.

  3. In one hand, take a garden hose and shoot water from the hose at the filter while holding it stretched out with the other hand.  Caution: The water will increasingly add weight to the filter and you don't want to add more water weight than you have to (since it will unnecessarily wear out the filter), so it is imperative that you shoot water at the filter to force out any "wall" of debris found on the filter, constantly moving the water shoot-out until the whole filter has been covered with water (do not keep the hose aimed only at one part of the filter).  Then, turn off the hose, and gently and carefully hit the filter against a sturdy clean board or wall to get rid of the excess water that has added weight to the filter in the course of shooting out the debris with the hose.

  4. Alternatively, if you find that the filter is too old, too dirty and otherwise you desire not to have the same filter in your air conditioner, you can easily have it replaced by buying a cut-to-fit filter replacement from the manufacturer of the portable room air conditioner / window air conditioner, a home improvement store, an appliance store or even online.  If you really want to save money in the long run, you may choose to buy the filter in a bundle of rolled-up filter, and all you would need to do then for each occasional replacement is cut-to-size a filter from this bundle.

  5. Having cleaned the filter (or bought a filter replacement), put it to the side and use a vacuum and an appropriate soft-brush, cleaning wand thereof to gently vacuum up the debris found inside the air conditioner and on its coils and fins, being careful not to bend these out of shape.

  6. Then, using a dampened cloth/rag, wipe away any excess debris found inside the air conditioner that is within reach, including any debris, making sure the air conditioner drains remain open. Use a scrubber brush to brush away debris when necessary, but be careful in using it.

  7. Allow the air conditioner to dry, and during this time, and after consulting your manufacturer's instruction manual for any particular motor lubrication instructions, lubricate the motor of the air conditioner.

  8. Put the filter back into place.

  9. Put into place and secure with any fasteners the air conditioner grille and any other metal casing you may have taken apart from the air conditioner.

  10. Put the air conditioner back into its original position in the house.

  11. Reconnect the electrical power to the air conditioner, making sure you use the same dedicate outlet that emits the appropriate voltage for such an air conditioner.  Turning it on, setting the appropriate thermostat settings and giving it about a half an hour, the air conditioner should start blowing cool air.

  12. If the above does not work, it is very likely that your air conditioner is in need of specialized repair or actually a refrigerant recharge; consult your manufacturer's instruction manual for repair options and, if need be, contact a repair technician specializing in portable room air conditioner / window air conditioner repair.

Ed the Handyman


Your Handyman Zone Team


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