Clean your Aprilaire filter by vacuuming it first, then rinsing it under running water if it is washable, and letting it dry completely before reinstalling

Most Aprilaire dehumidifier filters fall into two types: washable filters that you can rinse and reuse, and disposable filters that you replace. The model number on your unit determines which you have. Washable filters typically last several years with regular cleaning; disposable filters usually need replacement every three to six months depending on humidity levels and dust in your home. Cleaning a washable filter takes about ten minutes and costs nothing. Replacing a disposable one costs between $30 and $80 depending on the model.

The filter sits behind a removable front panel on your dehumidifier. Before you touch anything, unplug the unit from the wall outlet. This prevents accidental damage to the motor and keeps you safe while handling electrical equipment.

Key Takeaways

  • Unplug your dehumidifier before removing or cleaning any filter to avoid electrical hazard.
  • Washable filters need vacuuming first to remove loose dust, then rinsing under cold running water until the water runs clear.
  • Let a washable filter dry completely — at least two to four hours in a warm room or overnight — before putting it back in the unit.
  • Disposable filters cannot be washed and must be replaced when they look gray or clogged; keeping a spare on hand prevents downtime.
  • Check your filter monthly during heavy use seasons; a clogged filter reduces dehumidifier performance and can strain the motor.

Identifying whether your filter is washable or disposable

Look at the filter material itself. A washable filter is usually made of foam, mesh, or pleated fabric that feels sturdy and flexible. It typically has a plastic frame around the edges. A disposable filter is made of thin paper or fiberglass and feels fragile; it often has a cardboard frame. The model number on your dehumidifier's back or side panel will also tell you — check the Aprilaire website or your manual to confirm the filter type for your specific model.

If you are unsure, the safest approach is to assume it is disposable and replace it rather than risk damaging a paper filter by washing it. A damaged disposable filter cannot be repaired and will need replacement anyway.

Vacuuming the filter as the first step

Whether your filter is washable or disposable, start by vacuuming it. Use the upholstery brush attachment on a standard household vacuum, or use a handheld vacuum if you have one. Vacuum both sides of the filter gently, moving the brush in the direction of the pleats or mesh pattern, not against it. This removes loose dust and debris without pushing particles deeper into the filter material.

Vacuuming alone is often enough to restore a disposable filter's performance for another month or two if it is not heavily soiled. For a washable filter, vacuuming removes the bulk of the dust before you rinse it, which makes the rinsing step faster and more effective.

Rinsing a washable filter under running water

Hold the filter under a sink faucet or outdoor spigot and run cold water over it. Start with the side that faces the air intake (usually the side that was facing into the dehumidifier). Let the water flow across the filter for 30 to 60 seconds, then flip it and rinse the other side. Keep rinsing until the water running off the filter runs clear — this usually takes two to three minutes total.

Do not use hot water, which can damage foam or fabric filters. Do not scrub the filter with a brush or cloth, which can tear the material or push debris deeper into the fibers. If the filter has stubborn buildup, soak it in a sink of cool water for 15 to 20 minutes before rinsing, then rinse again under running water.

Drying 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 end in a warm, dry location — a laundry room, garage, or sunny windowsill works well. Do not lay it flat, which traps water inside the pleats or mesh. Let it dry for at least two to four hours, or overnight if possible. You can also use a hair dryer on a low, cool setting to speed drying, holding it six to eight inches away from the filter and moving it slowly across both sides.

Never reinstall a damp filter. Moisture inside the dehumidifier can damage the motor, cause mold growth, or reduce the unit's ability to pull water from the air. If you are in a hurry and the filter is still slightly damp, wait anyway — running the dehumidifier with a wet filter costs more in potential repairs than the time you save.

When to replace a disposable filter instead of cleaning

A disposable filter should be replaced when it looks gray or dark instead of white, when it feels stiff or clogged even after vacuuming, or when it has visible tears or holes. Most Aprilaire disposable filters are model-specific, so check your dehumidifier's manual or the filter frame itself for the correct replacement part number. Common models include the 5000 series and 6000 series, each with different filter sizes.

Order a replacement filter online or from a home improvement store. Keeping a spare filter on hand means you can swap it in when ready if the current one becomes clogged, rather than running the dehumidifier with a dirty filter or waiting for a delivery. Disposable filters typically cost $35 to $75 depending on the model and where you buy them.

Maintenance schedule to keep filters working longer

Check your filter once a month during the heating season (fall and winter) when indoor humidity is often highest and the dehumidifier runs frequently. In summer or in dry climates, check it every two to three months. If you have pets, live in a dusty area, or run the dehumidifier constantly, check it every two weeks.

A clean filter lets your dehumidifier work efficiently, removes moisture faster, and puts less strain on the motor. A clogged filter forces the motor to work harder, uses more electricity, and may shut down automatically if airflow becomes too restricted. Regular cleaning or replacement is the cheapest way to extend the life of your dehumidifier and keep it performing well.

Frequently Asked Questions

Can I wash a disposable filter?

No. Disposable filters are made of paper or fiberglass that falls apart when wet. Washing will destroy the filter and you will need to replace it. If you have a disposable filter and want to avoid replacement costs, vacuum it monthly and replace it only when it looks clogged or damaged.

What if my filter has mold or mildew on it?

Soak it in a solution of one part white vinegar to three parts water for 30 minutes, then rinse thoroughly under running water and dry completely. If mold returns quickly after cleaning, the dehumidifier itself may have moisture buildup inside — run it in a dry room for a few hours with the filter out to help dry the interior, or contact an Aprilaire service center.

How do I know which replacement filter to order?

Check the model number on the back or side of your dehumidifier unit, then look up that model on the Aprilaire website or in your manual. The manual will list the correct filter part number. You can also call Aprilaire customer service with your model number and they will tell you the exact filter you need.

Can I run the dehumidifier without a filter?

You should not. Running it without a filter allows dust and debris to enter the motor and internal components, which can cause damage or reduce performance. Always reinstall a clean filter or a new replacement before turning the unit back on.

Why is my filter getting clogged so quickly?

A filter clogs faster in dusty homes, homes with pets, or when humidity is very high and the dehumidifier runs constantly. Check that air vents around the dehumidifier are not blocked, and vacuum the room regularly to reduce dust in the air. If clogging continues, you may need to check the filter more often or consider upgrading to a model with a larger filter.