How to Clean a Honeywell Dehumidifier Filter and Coils

Why Cleaning the Filter and Coils Matters

A dehumidifier pulls room air through a filter and across a set of cold evaporator coils, where moisture condenses. Over time, dust and lint build up on both the filter and the coil fins. When this happens, airflow drops, the unit has to run longer to remove the same amount of water, and the compressor works harder. The result is higher energy use and a shorter lifespan for the appliance.

Keeping the filter and coils clean also supports healthy humidity levels. The CDC recommends keeping indoor humidity below 50% and names a dehumidifier as a useful tool for that goal. A unit that cannot push air through a clogged filter cannot hold humidity where you set it, which leaves damp corners where mold can start. The EPA notes that mold is controlled by moisture control, so a well-maintained dehumidifier is part of that effort.

Tools and Safety First

Before you clean anything on a Honeywell dehumidifier, unplug the unit and give the coils a few minutes to warm to room temperature. This prevents a sudden temperature change that could stress the refrigerant system. Gather a soft brush, a vacuum with a brush attachment, a clean cloth, and access to water. If you plan to wash the filter, you will also need a mild detergent.

Do not use water, bleach, or strong sprays on the electrical components or the coils unless the owner's manual explicitly allows it. These parts are sensitive and can corrode or short out if wet. The UMN Extension recommends using rubber gloves and eye protection when working around mold, which is wise if you suspect mold on the filter or coils.

• A vacuum cleaner with a soft brush attachment
• A soft paintbrush or a coil brush
• A clean, lint-free cloth
• Mild dish soap (optional)

Clean the Washable Filter

Most portable Honeywell dehumidifiers use a washable mesh filter that slides out from behind the front grille. Check your manual for the correct removal procedure; some models have a latch or a screw. Once the filter is out, tap it gently to remove loose dust, then rinse it under lukewarm running water. If it is very dirty, use a few drops of mild dish soap, then rinse again.

Let the filter air dry completely before you put it back. A damp filter can block airflow and become a breeding ground for mold. While the filter is drying, you can clean the exposed coils. If your Honeywell unit uses a disposable filter instead, replace it with a new one according to the manufacturer's schedule. Our guide on washable vs replaceable filters explains the difference.

Clean the Accessible Coils

The evaporator and condenser coils sit behind the filter and grille. Under normal operation, the evaporator coils stay cold while the condenser coils are warm, and both collect dust. Use a vacuum with a soft brush attachment to gently pull dust off the finned surfaces. Do not press hard; the aluminum fins bend easily and a bent fin reduces airflow just like a dirty one does.

If you see stubborn dirt, a soft paintbrush can work it loose without scratching the coils. Some owners use a fin comb to straighten bent fins, and a coil cleaner designed for air conditioners can be applied if the manual permits it. Always follow the instructions on the cleaner and avoid getting liquid on the fan motor or wiring. For a deeper explanation of coil cleaning, see our guide on internal coil cleaning.

When to Clean the Filter and Coils

There is no single cleaning schedule that fits every home. A unit in a dusty basement or a home with pets needs more frequent attention than one in a clean, closed room. A good routine is to check the filter every time you empty the water bucket, which you will likely do often during humid weather. If the filter looks gray or dusty, clean it. If you notice reduced airflow, a musty smell, or ice forming on the coils, those are signs the filter or coils are blocked.

Plan to vacuum the coils at least once a season, or whenever you clean the filter and see a layer of dust on the fins. The CDC says to clean up mold and fix moisture problems promptly, so if you see any mold on the filter or coils, treat it immediately. Since mold cannot grow without moisture, keeping your dehumidifier clean and running correctly is one of the best defenses. Read more about filter maintenance and mold prevention.

Keep Your Dehumidifier Working Efficiently

A clean Honeywell dehumidifier will move more air, remove more water per hour, and use less electricity. ENERGY STAR certified units already feature efficient coils, compressors, and fans, but even the best design cannot work through a clogged filter. By making filter cleaning and coil vacuuming part of your regular home maintenance, you protect your investment and keep indoor humidity at a level that discourages mold.

If you are shopping for a new unit and want one that is easy to maintain, look for models with a washable filter and accessible coils. Our best Honeywell dehumidifiers guide highlights designs with these features, and our energy efficient picks can help you choose a unit that saves energy. Regular cleaning also reduces the chance of ice buildup, which we explain in auto defrost.

What to pick for your use

Questions

How often should I clean my Honeywell dehumidifier filter?

Check the filter every time you empty the water bucket and clean it when it looks dusty. In dusty rooms, you may need to clean it more frequently.

Can I rinse the filter in the dishwasher?

No. Dishwasher detergent and heat can damage the filter mesh. Rinse it by hand with lukewarm water and a little mild soap, then let it air dry completely.

Can I use a bleach solution on the coils?

Do not use bleach or any liquid on the coils. Bleach can corrode the metal and damage the electrical components. Use a soft brush or vacuum to remove dust, and follow the manual's instructions if a coil cleaner is recommended.

What if my Honeywell dehumidifier has a disposable filter?

Check the manual for the replacement filter part number and replace it according to the manufacturer's recommendation. Some models have a filter clean signal that reminds you.

Is it necessary to clean the coils even if the filter is clean?

Yes. Dust can bypass the filter or settle directly on the fins. Inspect the coils whenever you clean the filter and vacuum them if you see any buildup. Keeping both clean ensures maximum airflow.