Filters are the maintenance task that almost no one does often enough, and it also has the biggest impact on energy consumption and the quality of the air you breathe. A clogged filter makes the unit work harder, cools less effectively, and accumulates mold and bacteria that then end up in your home's air. Cleaning takes ten minutes and requires no tools. Here’s how to do it properly and how often.
How often to clean them
In the middle of summer, with the air conditioner running every day, filters should be washed every two weeks. With moderate use, once a month is enough. At the start and end of the season, a more thorough cleaning is needed, and every two or three years a professional sanitization is recommended to reach places you can’t. If you have pets or someone suffers from allergies, shorten the intervals: hair and pollen clog the filters much faster.
Step-by-step filter cleaning
- Turn off and unplug the power. Always do this before opening anything.
- Open the front panel. It lifts up with two fingers on the sides; the filters are right behind it.
- Gently remove the filters. They are made of lightweight plastic and bend easily.
- Wash them under lukewarm water. Use running water and, if greasy, a drop of mild soap. Avoid hot water, as it deforms the plastic.
- Let them dry in the shade. Completely dry before putting them back. A damp filter develops mold in a day.
Errors to avoid
Do not use a hard brush or high-pressure water jets: they damage the filter mesh and make it ineffective. Never put a filter back while still wet, because moisture on the cold coil causes mold and a musty smell. Also, don’t forget the inside of the unit: behind the filters is the finned coil, which should be dusted carefully, and the fins should be straightened if bent. For that area, if you’re unsure, it’s better to have a professional sanitization done by someone with the right sprays and tools.
Impact on energy consumption
A dirty filter can increase energy consumption by 10 to 15 percent because air struggles to pass through and the compressor works harder to achieve the same cooling. Additionally, clogged filters promote ice formation on the coil, which leads to water leaks and extra strain on the motor. Ten minutes of cleaning every two weeks pays for itself in energy savings.
When to replace the filter
Standard filters last for years if cleaned carefully, but those with activated carbon or silver salts usually need to be replaced once per season because cleaning does not restore their filtering power. If you notice the mesh is torn, permanently yellowed, or odors return immediately after washing, it’s time to replace them. You can find replacements and quality filter models in our air conditioners section.
Frequently Asked Questions
How often should I clean the air conditioner filters?
In peak summer with daily use, every two weeks. With moderate use, once a month. If you have pets or allergies, even more often, because hair and pollen clog the mesh quickly.
Can I wash the filters with water and soap?
Yes, lukewarm water and a drop of mild soap work well. Avoid hot water and high-pressure jets, which deform and damage the mesh. Let them dry thoroughly in the shade before reinstalling.
What happens if I never clean the filters?
Energy consumption increases by 10-15 percent, the air becomes less cool, and the filters accumulate mold and bacteria that you breathe in. In worst cases, ice forms on the coil and the unit starts leaking water.