Clean A Window Air Conditioner

Clean the filter, vacuum the fins of the evaporator coil, and clean the condenser coil to make the air condition run better

By the experts at The Family Handyman

From The Family Handyman

Q. We bought a new window air conditioner several years ago, and aside from installing and removing it every year, we haven’t touched it. What should we be doing to keep it running efficiently and extend its life?

A. When you remove the unit this fall, take a half-hour or so to clean the filter, wipe out the unit and flush dirt from the condenser coil. If you keep the coils clean, that’s 90 percent of keeping an air conditioner in shape to last long and run efficiently. In fact, if you have an air conditioner that just won’t blow cold air, clean the coils before you call a pro to add coolant. Dirty coils are usually the culprit.

First, remove the filter and clean it with soap and water according to your owner’s guide. Then vacuum the fins of the evaporator coil (which is directly behind the filter) to remove dust and dirt.

Now move to the rear of the air conditioner to clean the condenser coil, which is usually the dirtier of the two. Cover the electric motor with a plastic bag to keep it and the wiring dry. Then take a hose-end nozzle and spray water from the outside inward (see photo).Wipe off the entire unit until it’s dry, then let it air dry for a couple of days before storing it. If you have an air compressor, it’s a good idea to blow air through the fins to speed drying and reduce the risk of rust setting in during storage.

From The Family Handyman - July/August 2004

• Air Conditioner Spring Cleaning
• This central air conditioner maintenance guide helps you get lower cooling bills while staying comfortable in summer.
•