How to Clean a Coil on an Air Conditioner
Air conditioner coils are some of the most vital parts of your unit's operating system. And because these parts are so delicate, it’s important to make sure the cleaning job is done right to avoid damage. While we recommend hiring a professional, you can clean a coil on an air conditioner on your own. Learn how below.
How to Locate the AC Coil
There are two coils to look for on an AC unit. These include the indoor evaporator coil and outdoor condensing coil.
- To find the indoor coil, look on your unit to see if it’s mounted to the AC or if it’s inside of a fan coil or air handler unit.
- The outdoor condenser coil can be found wrapped around the interior components or along the side wall. You’ll find it either well-exposed, protected by a wire coil guard or guarded by a protective metal outer panel.
Air Conditioner Coil Cleaning Methods
There are a variety of ways to clean an AC coil. You can use compressed air, detergent and commercial cleaners. Learn how to properly clean a coil on an air conditioner with each product below:
How to Clean AC Coils with Compressed Air
Note that this method is specifically for the outdoor coil. Use the compressed air to effectively remove surface dust, debris and dirt from the coil. Make sure you blow the air straight and not at an angle, as this can bend the fins. To remove heavier buildup, use a detergent or coil cleaning solution recommended for your unit.
How to Clean AC Coils with Household Detergent
If you don’t want to buy a commercial coil cleaning solution, the job can be done with a mild household detergent and water mixture. Just make sure the detergent isn’t highly acidic so you don’t damage the copper and alloy metals. Use a low-pressure sprayer to apply the mixture, then gently rinse it off.
How to Clean AC Coils with Commercial Cleaners
When using a commercial cleaner on your AC coils, you want to make sure you choose a foaming cleaner for the outdoor condenser coil and a self-rinsing cleaner for the indoor coil. Before you use the cleaner, clear any debris with a special fin brush or by hand. Then apply the cleaner and rinse the coil.
For the indoor evaporator coil, apply the self-rinsing commercial coil product. This product will rinse off when the system is turned on and the cooling process begins.
Why is Cleaning AC Coils Important?
When the unit is used regularly, the surface moisture and debris can build up. Over time, leaving the buildup can cause less effective heat transfer, meaning the hot air won’t be pushed out to cool down your home or office. Here are just a few issues dirty coils can cause:
- Decreased cooling
- Increased cooling costs
- Increased unit wear
- Increased operating temperatures
- Reduced comfort
- Frequent system repairs