How to Clean Your Window Air Conditioner Filters

Filters are the lungs of your air conditioner. Over the course of a humid summer, they collect dust, dander, and pollen that otherwise recirculate through your bedroom air. A clogged filter chokes the airflow, forcing the compressor to work harder, consume more electricity, and eventually freeze over, which turns your cooling machine into a noisy box that blows hot air. Cleaning them is a ten-minute job that pays for itself in energy savings and air quality. When you pull that filter out, you will likely see a gray layer of gunk that explains exactly why the unit has been struggling lately. Do this at least once a month during the cooling season, and your unit will run quieter and last much longer.

1. Kill the Power First. Turn the unit off via the control panel and pull the plug from the wall outlet. Never attempt to service the filter while the unit is connected to electricity.
2. Open the Grille. Most window units have a front panel that clips into place or is held by a single small screw. Gently pull the panel outward or release the side tabs to access the filter slot.
3. Extract the Mesh Filter. Locate the plastic-framed mesh screen and pull it straight up or out toward you. If it feels stuck, check for hidden locking tabs along the top edge.
4. Scrub the Gunk Away. Rinse the filter in a sink or bathtub using warm water. If there is significant buildup, use a drop of mild dish soap and a soft-bristled brush to gently scrub the mesh.
5. Dry Completely. Shake off excess moisture and let the filter air-dry in a well-ventilated area until it is 100% moisture-free. Do not use a hair dryer or heat gun as the plastic frames warp easily.
6. Restore Full Power. Slide the dry filter back into its tracks and snap the front grille securely into place. Plug the unit back in and, if your model has a filter light, reset the indicator.