Maintain the unit's filters
Unplug the air conditioner and remove the front cover. The filter itself may be attached to the back or the front cover or fastened in front of the coils.
Remove the filter and then wash it in soap and warm water. Squeeze out as much water as possible and let the filter dry before reinstalling it. Replace a damaged or torn filter.
Wipe the cover itself as well as the grill over the evaporator coils.
Vacuum the grill and evaporator coils gently. The aluminum fins on the coils are easily bent, so treat them with care.
Clean and flush the drainage system
Remove the drain tube from the air conditioner.
Clear any blockages in the drain tube by running a piece of wire or a bottlebrush through the tube.
Clean the tube itself by pouring a cup of chlorine bleach and water through the tube.
Things You Will Need
- Shop vac plus soap and water
- Chlorine bleach
- Screwdriver to remove cover
- Piece of wire or bottlebrush for cleaning drainage tube
- Turn the air conditioner down (or better yet - off) if you are going to be out of the room for a day or more (even if you are just going to work). This will give the fan in the unit a break and as an added bonus, save on your electrical bill.
- Install a window air conditioner out of direct sunlight if at all possible. North- or South-facing walls are better than East- or West-facing, since they don't get direct sun.
- Ensure that the seams all around the air conditioner are well sealed. This keeps the hot air outside and the cool air inside.
- Remove a window unit during the winter. If this isn't possible, cover it to protect if from debris and winter weather.
- Keeping an air conditioner's coils, fins and filters clean will ensure that it operates efficiently. A poorly maintained air conditioner not only loses efficiency (and cooling capability), but costs more to run.