With the heat of summer still bearing down on us, millions of window-mounted air conditioners are getting a real workout. And many owners of said units are wondering why their air conditioners aren’t working properly. In most situations, consumers can fix a window air conditioner themselves with the right information. If you have a window air conditioner in your home, here’s what you need to know to fix it, clean it and make it like new.
An easy DIY project
More than any other household appliance, window-type air conditioning units are most often neglected. This is a pity because they are big energy users. A little maintenance means that homeowners can save money on both utility and repair bills. In fact, with the right information and access to replacement parts, you should be able to fix a window air conditioner yourself, saving the cost of a service call or worse, replacing the unit altogether.
All residential window air conditioners have a cooling system consisting of four primary components: a compressor, an evaporator, a temperature sensing device, and a condenser.
Air conditioner cooling systems are better understood if you think of them more as a device that removes heat and humidity from the air than a device that cools the air.
These are the essential maintenance steps you should take to keep your window-mounted air conditioning unit operating in tip-top condition while using the least amount of energy:
Every month during the months of operation, replace (or clean) the filter located in the front grill. Cost: About $20.
The condensing coils on an air conditioner get very dirty, and the dirt tends to accumulate on the inside of the coils, out of sight. Once a year, remove the entire cover of the air conditioner to gain access to the coils and then clean them by blowing compressed or “canned air” on them. Falcon Dust-Off works great.
Here are solutions for the top three dilemmas with window air conditioners:
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program. As an Amazon Associate, we earn from qualifying purchases by linking to Amazon affiliated sites.
A motor is running but no air is blowing
Air conditioners have two motors: the compressor and the fan motor. It is possible that only one is running. If, after removing the cover of the unit you discover the fan blade is very stiff and difficult to rotate, the fan motor may need oiling or may need to be replaced.
Water leaks from the front of the unit
This is normal. All air conditioners should be installed so they tilt slightly back to allow for proper removal of condensed water that accumulates.
The air smells musty
Air conditioners remove moisture from the air. Most of it is evaporated from the unit. However, it is possible for some water to stagnate in the base of the air conditioner. Also, dirt, lint or dust can collect in the water pan at the base of the unit and absorb water, allowing mold and mildew to grow. All this leads to bad smells. Thoroughly clean the water pan each year when you clean the condenser coils.
Need more help with your window-mounted air conditioners? Check RepairClinic.com, where you can live chat with a repair technician, plus get the exact parts you may need. Super helpful site!
First published: 6-23-15; Revised & Updated 8-9-19