Many people don’t do anything, and this may shorten the life of your unit. Here are some recommended items that you can do to keep your window AC in great condition.
Wash the filter according to your user’s manual or when you are prompted by the unit. A clean filter will ensure that an adequate amount of room air will be circulating over both the evaporator coil and the condenser, which will help it to function properly for years.
Clean the condenser fins if needed. These are on the back (outside) of the unit and are very thin and fragile. Brush them gently with a soft brush to remove dust, leaves or other outdoor debris. Carefully straighten any fins that are bent or flattened.
Store the unit during the cold weather season if you can. This is a good time to give it a thorough visual inspection. If you cannot store it, cover it on the outside with an inexpensive cover that can be purchased online or in local stores.