When your room air conditioner doesn’t get cold like it used to, you may want to look into how to recharged or clean it. Even if you do not want to hire a professional, you should still look at your user’s manual to make sure you have both the equipment and the skills you need.
Unplug the unit and place it in a safe place where you can work on it, preferably outdoors where nothing could be damaged.
Remove the filter, frill and metal case by unscrewing them, but be careful not to damage the coil fins.
Clean the filter by washing it in warm water, or replace it with a new filter. Use a soft brush or a vacuum with a soft attachment to clean the coil fins (you may also want to clean the evaporator and condenser coils while the unit is open).
Being careful to protect the motor and wiring with plastic. Spray water through the fins from the fan side, then drain out all the water and wipe out the air conditioning unit with a dry cloth. Make sure that it is thoroughly dry before moving on.
Make sure to lubricate the motor so that it will function correctly. See your user’s manual for specific steps regarding your unit.
After everything is completed, reassemble the unit and reinstall it.