How to Replace a Dehumidifier Filter: Complete Guide for All Brands
Replace the filter on any brand of dehumidifier in about five minutes. A clogged filter is the most common reason a dehumidifier stops pulling moisture properly, and you can usually spot it early by checking the airflow coming out of the top grille. If the air feels weak or the unit has to run twice as long to drop the humidity, the filter needs changing – often long before the reminder light comes on. This dehumidifier filter replacement guide all brands covers the steps that work for Danby, Frigidaire, GE, LG, Midea, Santa Fe, Soleus Air, and most other major manufacturers.
What You’ll Need Before Replacing the Filter
Grab these items before you open the unit so you aren’t hunting for tools mid-job.
- Replacement filter – Match the part number from your owner’s manual or measure the old filter (length × width × thickness). Common sizes include 9×11×1 inches.
- Screwdriver – Some models use Phillips screws to secure the filter door or frame; others snap on.
- Vacuum with brush attachment – For cleaning the filter housing and any condenser coils you can reach.
- Gloves – Optional, but filters trap dust, pollen, and mold spores that can irritate skin.
- Rag or microfiber cloth – To wipe up any moisture or grime inside the compartment.
Safety step: Unplug the dehumidifier for at least 30 seconds before opening any panel. This gives the fan and compressor time to stop fully and removes any risk of the unit starting while your hands are inside.
Step-by-Step Filter Replacement
These steps work for the vast majority of portable dehumidifiers. Whole-house units follow the same logic but often have the filter behind a grille on the return duct.
Step 1 – Locate the filter compartment. Check the back, side, or front of the unit near the bottom. Most portable models have a removable grille or a pull-out tray. If you see a small cutout about the size of a standard HVAC filter, that’s it.
Step 2 – Remove the old filter. Slide the tray out or unscrew the grille. Pay attention to the orientation – some filters have an arrow showing airflow direction. If your old filter is installed backward (arrows pointing at the fan instead of toward it), the new filter will be less effective.
Step 3 – Vacuum the housing. Use the brush attachment to clean dust, lint, and debris from the filter compartment and any exposed condenser coils nearby. Blocked coils cause the compressor to run hotter and reduce efficiency. This is a good time to spot a common early failure: if the coils have heavy ice buildup, the filter was probably overdue and airflow was choked off.
Step 4 – Insert the new filter. Slide the replacement filter into the same slot, making sure it sits flat against the frame. If the filter is curled or bent at the edges, it won’t seal, and unfiltered air will bypass the media. For tray-style units, push the tray back in until it clicks.
Step 5 – Close the grille and plug the unit back in. Snap the door shut or fasten the screws. Turn the dehumidifier on and set the humidity target to a normal level (45–50%). Listen for a smooth airflow sound and feel the outlet grille – you should feel a steady, noticeable stream of air within 30 seconds.
Filter Compatibility by Brand
Use this table to find a replacement filter for common brands. Always double-check your model number before ordering. For Frigidaire models, our step by step guide to replace a Frigidaire water filter follows the same careful measurement approach.
| Brand / Series | Typical Filter Size | Notes |
|---|---|---|
| Danby (most portable) | 8 × 10 × 0.5 in | Often uses a foam-type pre-filter plus a carbon pad. Replace both if applicable. |
| Frigidaire (FFAD / FGAC series) | 8 × 10 × 0.5 in | Slide-out tray on the back; washable pre-filter available. |
| GE (ADEL / AEL series) | 9 × 11 × 1 in | Standard MERV-13 replacement fits many models. |
| LG (recent portables) | 9 × 11 × 1 in | Check for ‘washable’ labels – some models use a permanent filter that only needs rinsing. |
| Midea (Cube / Energy Star series) | 7.5 × 9 × 0.5 in | Proprietary filter shape in some models; order the manufacturer’s part. |
|
| Santa Fe (Compact70, Ultra70, Element) | 9 × 11 × 1 in | MERV-13 rated; available in multi-packs. The Cooyafan 9×11×1 MERV 13 Replacement Dehumidifier Filter is a compatible option for these models. |
| Soleus Air (portable) | 8 × 10 × 1 in | Also fits some Danby models; carbon pad is optional. |
How to Tell If Your Filter Needs Replacing Now
Instead of waiting for a blinking light, run through these five checks. If any item is a “No,” replace the filter.
- Airflow test: Hold your hand 6 inches from the outlet grille. Is the air strong and steady?
- Moisture removal: Does the dehumidifier run 2+ hours without filling the bucket or noticeably lowering humidity?
- Visual inspection: When you pull the filter out, is it gray, dusty, or visibly clogged?
- Smell test: Does the room smell musty or stale even after the unit runs?
- Time check: Has it been more than 3 months (or 1 month during heavy use in a damp basement)?
If you answered “No” to two or more of these, the filter is likely overdue for a change.
Where Most People Get Stuck
Wrong filter size. It’s easy to buy a filter that looks close but is a quarter-inch too short or too deep. A loose filter lets unfiltered air bypass, which means dust lands on the condenser coils. Over a few weeks the coils get coated, the dehumidifier loses efficiency, and the compressor may short-cycle. The symptom is deceptive: the unit runs for hours with the bucket barely filling, yet the humidity never drops. The actual cause is that the filter is too small to seal against the frame, so air sneaks around it. Safer next move: Always measure your old filter with a tape measure before ordering. Write the exact dimensions on the inside of the unit door with a permanent marker. If the old filter is bent or warped, use the frame opening dimensions instead.
Forgetting to remove plastic packaging. Some replacement filters arrive shrink-wrapped or with a thin plastic film on one side. Installing the filter with the plastic still on blocks airflow completely. Fix: Peel off any visible plastic before sliding the filter in. The filter media should feel like fibrous cloth, not plastic. A similar mistake happens with refrigerator air filters – our guide on how to replace air filter in a Frigidaire refrigerator shows what to look for.
Installing the filter backward. Many filters have an airflow arrow printed on the side. If you put the arrow pointing at the fan instead of away from it, the filter media lifts off the frame and creates a gap. Fix: The arrow should point toward the fan (into the unit) – that’s the direction air travels.
Ignoring the washable pre-filter. Several portable models have a permanent or washable pre-filter behind the external grille, plus a disposable filter deeper inside. If you only change the disposable one but never rinse the pre-filter, the unit still struggles to breathe. Fix: Rinse the washable pre-filter with cool water every 30 days and let it dry completely before reinstalling.
How to Confirm the New Filter Is Working
After replacement and reassembly, run a short success check.
1. Plug the dehumidifier in and set it to 50% humidity.
2. Walk away for 15 minutes.
3. Return and place your hand at the outlet grille. You should feel a stronger, cooler airflow than before.
4. Check the humidity display or a separate hygrometer. A noticeable drop (even 3–5%) in 15 minutes means the unit is pulling moisture effectively.
5. Listen for the compressor to cycle off when the set humidity is reached – that confirms the system is operating within normal parameters.
If the air still feels weak or the unit freezes again within a few days, the problem may not be the filter. Check for blocked condenser coils, a failing fan motor, or a refrigerant leak. Those issues require a qualified appliance repair technician.
Frequently Asked Questions
How often should I replace a dehumidifier filter?
For normal home use (summer months in a basement), replace every 3 months. In heavy-use seasons (constant 80%+ humidity) or if you have pets, replace every 30–45 days. Washable filters should be rinsed monthly and replaced annually.
Can I wash and reuse a disposable dehumidifier filter?
No – washing a pleated paper or synthetic disposable filter can collapse the media fibers and reduce efficiency. Only wash filters specifically labeled as “washable” or “permanent.” For those, rinse with plain water, let dry fully, and reinstall.
What happens if I run the dehumidifier without a filter?
Particles bypass the filter and accumulate on the condenser coils and fan blades. This causes the compressor to overwork, the fan to slow down, and eventually the unit may freeze up or fail entirely. Always run the dehumidifier with a filter in place.
My filter size isn’t in the table. How do I find the right one?
Check the owner’s manual or the sticker inside the filter compartment. Many brands print the part number directly on the old filter. You can also measure the old filter’s length, width, and depth, then search for a universal replacement with those exact dimensions.
Is a MERV-13 filter better than a standard one for a dehumidifier?
MERV-13 traps smaller particles (pollen, pet dander, some smoke) and is a good upgrade if you have allergies. However, it also creates more airflow resistance. Make sure the dehumidifier fan is strong enough to pull air through a denser filter. Most modern portable models handle MERV-13 fine; older budget units may struggle. If you notice weaker airflow after switching to MERV-13, go back to a standard MERV-8 or the manufacturer-recommended filter.