When to Change Your Dehumidifier Filter
Why Your Dehumidifier Filter Matters
Your dehumidifier works hard to pull excess moisture out of the air, especially in basements, crawl spaces, and other damp areas of your home. The filter is what keeps dust, pet hair, and debris from clogging the internal components.
When the filter gets dirty, several things happen:
- Reduced efficiency — The unit has to work harder to pull air through a clogged filter, removing less moisture per hour.
- Higher energy costs — A struggling dehumidifier uses more electricity for the same (or worse) results.
- Shorter lifespan — Overworking the motor and compressor accelerates wear and can lead to premature failure.
- Ice buildup on coils — Restricted airflow causes the evaporator coils to get too cold, leading to frost or ice that further reduces performance.
- Poor air quality — A dirty filter can itself become a source of musty odors, and in severe cases, mold can grow on the accumulated debris.
The good news: changing or cleaning your dehumidifier filter is one of the simplest home maintenance tasks you can do.
How Often to Change or Clean the Filter
The general recommendation is every 3 to 6 months, but the right schedule for your home depends on several factors:
| Factor | More Frequent (Every 2-3 Months) | Less Frequent (Every 4-6 Months) | |--------|----------------------------------|----------------------------------| | Location | Dusty basement, workshop, garage | Clean living space, bedroom | | Pets | Multiple pets or heavy shedders | No pets | | Usage | Runs continuously or 12+ hours/day | Runs occasionally or seasonally | | Construction nearby | Active renovation, drywall dust | No recent construction | | Environment | Rural/agricultural area with pollen | Urban, well-sealed home |
If your dehumidifier has a reusable filter (most do), you can wash and reinstall it rather than buying a replacement each time.
How SAM Helps
If your dehumidifier is registered in your Shipshape equipment inventory, SAM can help in several ways:
- Maintenance reminders — SAM tracks when you last serviced the filter and reminds you when it is time to check it again.
- Efficiency monitoring — If Shipshape monitors your dehumidifier's power usage through a smart plug or energy sensor, SAM can detect when the unit starts drawing more power than usual. This is often the first sign of a dirty filter.
- Runtime tracking — SAM can notice if your dehumidifier is running longer than usual to maintain the same humidity level, another indicator that the filter may need attention.
- Humidity correlation — If humidity in the room is climbing even though the dehumidifier is running, SAM will flag the discrepancy and suggest checking the filter.
Step-by-Step: How to Change or Clean the Filter
Follow these steps for most residential dehumidifiers:
1. Turn Off and Unplug
Always disconnect the unit from power before opening any panels. This is a safety step, not optional.
2. Locate the Filter
The filter is typically behind a front panel or side panel that clips or slides off. Check your owner's manual if you are not sure. Common locations:
- Front-intake models — Filter is behind a removable front grille
- Top-intake models — Filter is under the top cover or bucket area
- Side-intake models — Filter slides out from the side panel
3. Remove the Filter
Gently pull the filter out. Take note of which direction it faces (some filters have an airflow arrow). If there is no arrow, it does not matter which side faces in.
4. Inspect It
Hold the filter up to a light source:
- If you can see light through it easily, it may just need a light cleaning
- If light is blocked by visible dust and debris, it needs a thorough wash or replacement
5. Clean or Replace
For reusable filters:
- Rinse under warm running water
- For stubborn buildup, soak in warm water with a few drops of mild dish soap for 10-15 minutes
- Gently scrub with a soft brush if needed
- Rinse thoroughly until water runs clear
- Let the filter dry completely before reinstalling. A damp filter can promote mold growth inside the unit. Allow at least 4-6 hours of air drying.
For disposable filters:
- Check your owner's manual or the filter itself for the correct replacement size and part number
- Insert the new filter in the correct orientation
- Dispose of the old filter
6. Reinstall
Slide or clip the clean (and fully dry) filter back into place. Reattach the panel.
7. Plug In and Restart
Plug the unit back in and turn it on. Check that air is flowing freely through the filter area.
Signs Your Filter Needs Attention Now
Do not wait for the calendar if you notice any of these:
- Reduced airflow — Put your hand near the air outlet. If the flow feels weaker than usual, the filter is likely the culprit.
- Unit running longer than usual — If the dehumidifier used to cycle off after a few hours but now runs almost continuously, a dirty filter may be forcing it to work overtime.
- Ice forming on the coils — Look inside the unit (with it turned off). If you see frost or ice on the metal coils, restricted airflow from a dirty filter is a common cause. Let the ice melt completely before running it again.
- Musty smell from the unit — If the dehumidifier itself smells musty, the filter may be harboring mold or mildew. Clean it immediately and consider replacing it if the smell persists.
- Humidity not dropping — If the room's humidity stays high even with the dehumidifier running, the filter is one of the first things to check.
Pro Tips
- Write the date on the filter with a permanent marker each time you clean or replace it. This gives you a quick visual reference for when it was last serviced.
- Keep a spare disposable filter on hand so you can swap immediately when needed.
- Vacuum the filter lightly between deep cleanings to extend the time between washes.
- Check the drain while you have the filter out. If your dehumidifier uses a continuous drain hose, make sure it is not kinked or clogged.
- Add the dehumidifier to your Shipshape app with its make, model, and install date. This unlocks SAM's maintenance reminders and lets your service professional see it during assessments.
When to Call a Professional
A filter change is a DIY-friendly task. But call your service professional if:
- The coils are heavily iced even after cleaning the filter and allowing a full defrost
- The unit makes unusual noises (grinding, buzzing, clicking)
- The dehumidifier is not turning on at all
- You notice water leaking from the unit (not from the drain)
- The unit is more than 8-10 years old and struggling to keep up. It may be time for a replacement rather than continued maintenance.
SAM can connect you to your service professional directly from the app if you need help.