Quick Answer
To clean a Honeywell humidifier, unplug it, empty the tank and base, and remove the wicking filter. Soak the base and tank in undiluted white vinegar for about 20 minutes to dissolve scale, scrub with a soft brush, and rinse. Then disinfect with 1 teaspoon of bleach per gallon of water for about 20 minutes, rinse well and air-dry. Clean weekly.
Key Takeaways
- Honeywell’s typical routine is daily water changes, weekly descaling with vinegar and disinfecting with a weak bleach solution.
- Never use vinegar and bleach together; rinse thoroughly between them.
- Don’t wash the wicking filter in vinegar or bleach; replace it every 1-3 months, or sooner if it’s hard and crusty.
- Keep water out of the motor housing and never submerge the top unit.
- Always confirm steps in your specific model’s manual, since cool mist, warm mist and UV models differ.
Humidifiers hold standing water at room temperature, which is an ideal place for mineral scale, bacteria and mold to build up. The EPA and other health agencies recommend cleaning home humidifiers regularly and changing the water often so you don’t spray contaminants into the air. Here is a straightforward routine for Honeywell cool moisture and other common models.
How Often Should You Clean a Honeywell Humidifier?
| Task | How often | What it does |
|---|---|---|
| Empty, rinse and refill the tank | Daily | Prevents stagnant water |
| Descale base and tank with vinegar | Weekly | Removes white mineral buildup |
| Disinfect with bleach solution | Weekly | Kills bacteria and mold |
| Replace wicking filter | Every 1-3 months | Keeps output and air quality up |
| Deep clean and dry before storage | End of season | Prevents mold during storage |
Hard water and heavy daily use mean more frequent cleaning and filter changes. If you see slime, pink or black film, or smell anything musty, clean immediately.
What Do You Need?
- Undiluted distilled white vinegar (about 16 oz)
- Unscented household chlorine bleach
- Measuring spoon (teaspoon)
- Soft-bristle brush or old toothbrush
- Soft cloth or paper towels
- Replacement wicking filter for your model (Honeywell sells these under part numbers listed in the manual)
- Rubber gloves
How Do You Clean a Honeywell Humidifier Step by Step?
Step 1: Unplug and Disassemble
Turn the humidifier off and unplug it. Lift off the water tank, then remove the top housing (the part with the fan and controls) and set it aside on a dry surface. Pull the wicking filter out of the base.
Step 2: Empty and Rinse
Pour any water out of the tank and base over a sink. Rinse both with clean water to remove loose sediment. Never pour water into or over the top housing, which contains the motor.
Step 3: Descale With White Vinegar
Pour undiluted white vinegar into the base so it covers the scale, and add some to the tank and swirl it around. Let it sit for about 20 minutes to soften mineral deposits. Scrub with a soft brush, paying attention to corners and the tank valve, then pour out the vinegar and rinse thoroughly.
Step 4: Disinfect With a Bleach Solution
Mix 1 teaspoon of bleach in 1 gallon of water. Fill the tank partway with the solution, cap it and shake, then pour some into the base. Let it stand about 20 minutes, swirling occasionally, then empty it.
Step 5: Rinse Until There Is No Bleach Smell
Rinse the tank and base with clean water several times until you can no longer smell bleach. Leftover bleach can be released into the air when you run the unit, so don’t rush this step.
Step 6: Wipe the Housing and Replace the Filter
Wipe the outside of the top housing and the fan grille with a dry or barely damp cloth. Install a new wicking filter if the old one is stiff, discolored or crusty, then reassemble, refill with fresh cool water and plug the unit back in.
Safety: Never mix vinegar and bleach, or bleach with any other cleaner; combining them can release toxic chlorine gas. Do one, rinse completely, then do the other. Work in a ventilated room and wear gloves.
Can You Clean a Honeywell Humidifier Filter?
Honeywell wicking filters are designed to be replaced, not washed. Soaking them in vinegar or bleach can damage the material and the antimicrobial treatment some filters carry, and leftover bleach could be blown into the room. Between replacements, you can let the filter dry completely when the unit isn’t in use and flip it if your model allows.
Replace the filter when it becomes hard, crusty, discolored or smelly, or when the room stops feeling humid even with a full tank. Most people need a new one every 1-3 months during heating season, more often with hard water.
How Do You Clean Warm Mist and UV Models?
- Warm mist (steam) models: let the unit cool completely first. Descale the heating chamber with vinegar as described in the manual; these models build scale faster because they boil water.
- UV models: the UV bulb reduces some germs in the water but does not replace cleaning. Keep water away from the bulb compartment and replace the bulb on the schedule in the manual.
- Ultrasonic models: clean the transducer (the small disk at the bottom) gently with a soft brush and vinegar; never scrape it with metal tools.
What Are the Most Common Cleaning Mistakes?
- Topping off instead of changing water: old water keeps growing bacteria.
- Submerging the top unit: water in the motor can ruin it and create a shock hazard.
- Putting parts in the dishwasher: heat can warp tanks and seals; check your manual first.
- Using scented or concentrated cleaners: residue gets sprayed into the air you breathe.
- Storing it damp: mold grows quickly in a closed, wet unit.
How Can You Keep It Cleaner Longer?
Use distilled or demineralized water if your tap water is hard; it cuts scale and the white dust some humidifiers produce. Keep indoor humidity between about 30% and 50%, which is the range the EPA suggests; higher levels encourage mold and dust mites. An inexpensive hygrometer tells you when to turn it down.
Fold humidifier care into your weekly cleaning routine, along with other tools that collect moisture and grime, like your mop; see our guide to cleaning a spin mop head. For wiping down nearby hard surfaces, our guide on using Lysol disinfectant spray properly covers contact times, but never spray disinfectants into the humidifier itself.
How Do You Store a Humidifier for Summer?
At the end of the season, do a full clean using the steps above, throw away the used filter and let every part air-dry for a day or two. Store the unit in its box or a bag in a dry place, and buy a fresh filter for next season. If your home also has a Honeywell thermostat, this is a good time to change the thermostat batteries too.
When Should You Replace the Humidifier?
Replace the unit if the tank or base is cracked and leaking, the fan is loud or doesn’t spin, mold keeps returning after thorough cleaning, or it’s running but no longer adds moisture with a fresh filter. Contact Honeywell customer support for warranty questions and genuine replacement parts.
Frequently Asked Questions
Can I run vinegar through my Honeywell humidifier?
No. Use vinegar only to soak and scrub the tank and base while the unit is unplugged, then rinse thoroughly. Running vinegar in the humidifier would spread a vinegar mist into the room and can damage the filter. Always refill with clean water after cleaning.
Why is my Honeywell humidifier filter turning brown?
A brown or orange filter is usually caused by minerals and iron in tap water building up as the water evaporates. It is normal over time, but a hard, crusty filter wicks poorly. Replace it, and consider distilled water if you have hard water.
Can I use hydrogen peroxide instead of bleach?
Some people use 3 percent hydrogen peroxide to disinfect humidifier tanks, and it leaves no chlorine smell. Honeywell manuals generally describe a diluted bleach solution, so follow your manual, rinse thoroughly with either, and never mix peroxide with vinegar or bleach.
Is it bad to sleep with a dirty humidifier?
A dirty humidifier can spray bacteria, mold and mineral particles into the air, which may irritate airways, especially for people with asthma or allergies. Clean it weekly, change water daily and keep room humidity between about 30 and 50 percent.
How do I get the musty smell out of my humidifier?
Descale with vinegar, disinfect with the bleach solution, rinse well and replace the wicking filter, which is usually the source of lingering odor. Let all parts dry fully before reassembling. If the smell returns quickly, the unit may have mold in hard-to-reach areas.
