Clean the filter by removing it, rinsing it under running water, and letting it dry completely before reinstalling
Most Frigidaire dehumidifiers have a removable air filter that traps dust and particles before they enter the unit. Over time, this filter clogs and reduces how well the dehumidifier works. Cleaning it takes about 10 minutes and requires only water and a soft brush—no tools or replacement parts needed. You should clean the filter every two weeks if you run the unit daily, or monthly if you use it less often.
A clogged filter makes the dehumidifier work harder, uses more electricity, and may not pull moisture from the air as effectively. If you notice the unit running but the room staying humid, a dirty filter is often the first thing to check. The good news is that cleaning restores performance when ready, and the filter lasts for years with regular maintenance.
Key Takeaways
- Unplug the dehumidifier before you touch the filter to avoid electrical shock.
- The filter is usually located on the back or side of the unit and slides or clips out without tools.
- Rinse the filter under cool running water and use a soft brush to remove stubborn dust—never use hot water or a pressure washer.
- Let the filter dry completely in a warm, dry place for at least two hours before putting it back in the unit.
- If the filter is torn, stained permanently, or no longer holds its shape after drying, it is time to replace it with a new one.
Locate and remove the filter safely
Start by unplugging the dehumidifier from the wall outlet. This is the most important step—it prevents electrical shock and ensures the unit is completely off before you open it. Wait a few seconds after unplugging to let any residual power drain.
The filter location varies by Frigidaire model, but it is almost always on the back or side of the unit. Check your owner's manual for the exact spot, or look for a rectangular panel or grille that feels slightly loose. Some filters slide straight out; others are held by clips or a plastic frame that you release by hand. Do not force anything—if it does not slide or unclip easily, you may be pulling the wrong part.
Once you have located the filter, gently pull it toward you. It should come free without resistance. Set it on a clean surface like a sink or bathtub where you can rinse it without making a mess.
Rinse the filter under running water
Hold the filter under cool running water from a faucet. Let the water flow through the filter from the side that faces into the unit (the side that was facing the air intake). This direction pushes dust out rather than deeper into the filter material. Rinse for 30 to 60 seconds, rotating the filter so water reaches all areas.
For stubborn dust buildup, use a soft brush—a soft toothbrush or a dedicated filter brush works well. Brush gently in the direction of the filter material, never against it. Do not scrub hard or use a stiff brush, because you can tear the filter mesh. If you see dirt still trapped after brushing, rinse again under running water.
Never use hot water, a pressure washer, or cleaning chemicals on the filter. These can damage the filter material and reduce its ability to trap particles. Plain cool water is all you need.
Dry the filter completely before reinstalling
After rinsing, hold the filter upright and let excess water drip off for a minute or two. Then stand it on its edge in a warm, dry place—a windowsill, a shelf near a vent, or a room with good air circulation works well. Do not lay it flat, because water can pool inside the filter material.
The filter needs at least two hours to dry completely, though four to eight hours is better. You can speed this up by placing it in front of a fan or in a room with low humidity. The filter is dry enough to reinstall when it feels dry to the touch and no moisture drips from it when you pick it up.
Never reinstall a damp filter. Running the dehumidifier with a wet filter can damage the motor and reduce performance. If you are in a hurry, wait until the next day to turn the unit back on.
Reinstall the filter and test the unit
Once the filter is completely dry, slide or clip it back into place. Make sure it sits flush against the frame with no gaps around the edges—gaps let unfiltered air bypass the filter. If the filter does not fit snugly, remove it and check that you are inserting it in the correct direction. The side that was facing the air intake should face that direction again.
Plug the dehumidifier back in and turn it on. Listen for normal operation—the fan should run smoothly without rattling or grinding sounds. If you hear unusual noises, unplug the unit and check that the filter is seated correctly.
When to replace the filter instead of cleaning it
Most Frigidaire dehumidifier filters can be cleaned and reused many times. However, if the filter shows any of these signs, it is time to replace it with a new one. A torn mesh, permanent stains that do not rinse away, or a filter that no longer holds its shape after drying all mean the filter has reached the end of its life.
If you clean the filter regularly and it still does not restore the dehumidifier's performance, the filter may be permanently clogged. Replacement filters are inexpensive and widely available online or at appliance stores. Check your model number (usually on a sticker inside the unit or on the back) to order the correct replacement.
Cleaning schedule and maintenance tips
Set a cleaning schedule based on how often you use the dehumidifier. If it runs eight hours or more per day, clean the filter every two weeks. If it runs a few hours daily, clean it monthly. In dusty environments—basements, garages, or homes with pets—you may need to clean it more often.
A quick visual check takes five seconds: look at the filter and see if dust is visible on the surface. If it looks gray or brown instead of white or light colored, it is time to clean. This habit prevents the filter from getting so clogged that it damages the motor.
Keep the area around the dehumidifier clean as well. Dust on the floor or shelves near the unit gets pulled into the air intake, which means more work for the filter. Vacuuming or wiping the surrounding area once a week reduces the load on the filter and extends the time between cleanings.
Frequently Asked Questions
Can I run the dehumidifier without the filter?
No. Running it without a filter lets dust and particles enter the motor and internal components, which can cause damage or failure. Always reinstall the filter before turning the unit back on, even if you are waiting for a replacement to arrive.
What if the filter is still wet when I need to use the dehumidifier?
Wait until it is completely dry. Running the unit with a damp filter can short-circuit the motor or reduce performance. If you need the dehumidifier urgently, order a second filter so you can use one while the other dries.
Is there a filter inside the water tank I need to clean too?
No. Frigidaire dehumidifiers have only one air filter. The water tank collects condensation and does not need a filter. Empty the tank regularly (or set it to drain continuously if your model has that option), but do not look for a second filter inside it.
How do I know which direction the filter goes back in?
The filter should go back the way it came out. Most filters have an arrow printed on the frame showing the direction of airflow. If yours has an arrow, point it toward the inside of the unit. If there is no arrow, look at how it was oriented before you removed it and match that position.
Can I wash the filter in a washing machine or dishwasher?
No. Machine washing can tear the filter or damage its structure. Hand rinsing under running water with a soft brush is the only safe cleaning method. The filter material is delicate and needs gentle handling.