Most dehumidifiers run between 50 and 80 decibels, which is roughly as loud as a normal conversation or a busy office

The noise level depends on the model, the compressor type, and the fan speed. A refrigerant dehumidifier (the most common type for homes) typically produces 50 to 70 decibels on its lowest setting and can reach 75 to 80 decibels on high. A desiccant dehumidifier tends to be quieter, often running at 40 to 60 decibels because it uses a spinning wheel instead of a compressor. Portable units are usually louder than whole-house systems because they pack the motor and fan into a smaller space.

For perspective: 50 decibels is about the volume of a quiet office or library. 70 decibels is a normal conversation at arm's length. 80 decibels is heavy traffic or a loud alarm clock. If you plan to run the dehumidifier in a bedroom or living room during the day, a unit rated below 60 decibels will be noticeably less intrusive. If you only run it at night or in a basement, noise matters less.

Key Takeaways

  • Refrigerant dehumidifiers typically range from 50 to 80 decibels depending on fan speed, while desiccant models are usually quieter at 40 to 60 decibels.
  • Placing the unit on a rubber mat, away from walls and corners, and ensuring the coils stay clean will reduce vibration and noise.
  • Running the dehumidifier on a lower fan speed cuts noise significantly but may take longer to remove moisture from the air.
  • Whole-house dehumidifiers installed in a basement or attic are quieter in living spaces than portable units because the motor sits away from where you spend time.

Why dehumidifiers make noise in the first place

A refrigerant dehumidifier works by running a compressor that cycles refrigerant through coils, similar to an air conditioner. The compressor vibrates as it runs, and the fan that pulls air across the cold coils adds its own sound. Both components together create the hum and whir you hear. The compressor cycles on and off as the unit reaches its target humidity level, so the noise is not constant—it quiets down when the compressor shuts off between cycles.

Desiccant dehumidifiers use a different method: a spinning wheel coated with a moisture-absorbing material pulls water from the air. The wheel and its motor are the main noise sources, and because there is no compressor, the overall sound is often lower and more consistent. However, desiccant units work less efficiently in cold temperatures and use more energy, so they are less common in basements or crawl spaces during winter.

How to measure the noise level before you buy

Check the product specifications or manual for the decibel rating. Manufacturers usually list noise at the lowest and highest fan speeds, often measured at a standard distance (usually 3 to 6 feet away). A rating of 50 dB at low speed and 75 dB at high speed tells you the full range. If the listing does not include decibels, look for customer reviews that mention noise—people often describe whether a unit is "whisper quiet" or "sounds like a window air conditioner."

If you can, listen to the unit in a store or watch a video review where someone has recorded the sound. A 10-decibel difference is noticeable to the human ear, so a 60 dB unit will sound noticeably quieter than a 70 dB unit. Size also matters: larger units with bigger fans and motors tend to be louder, but they also remove moisture faster, so you may not need to run them as long.

Placement and setup to minimize noise

Place the dehumidifier on a rubber mat or vibration-dampening pad rather than directly on a hard floor. This absorbs vibration from the compressor and reduces the noise that travels through the floor and into walls. Position the unit away from corners and at least 6 inches from walls—corners and walls reflect sound and make the unit seem louder than it is. If you have the space, placing it in the center of a room or basement will distribute the sound more evenly and make it less noticeable.

Keep the intake and exhaust vents clear of obstructions. A blocked vent forces the fan to work harder and sound louder. Dust and debris on the coils also increase noise, so clean or replace the filter every month during heavy use. A well-maintained unit runs more efficiently and more quietly than one with clogged coils or a dirty filter.

Adjusting fan speed to reduce noise

Most dehumidifiers have a low, medium, and high fan setting. Running on low speed cuts the noise by 5 to 10 decibels compared to high speed, making a significant difference in how intrusive the unit feels. The trade-off is that low speed removes moisture more slowly, so the dehumidifier may need to run longer or more often to reach your target humidity level.

If your goal is to maintain a specific humidity level (usually 30 to 50 percent in a home), set the unit to low speed and let it run continuously rather than switching to high speed for short bursts. Continuous low-speed operation is quieter overall and uses less energy than cycling between high and low. Many modern dehumidifiers have a humidity sensor that automatically adjusts the fan speed, so the unit runs on low when the air is already fairly dry and only increases speed when needed.

Choosing a quieter type of dehumidifier

If noise is a major concern, a desiccant dehumidifier may be worth considering, even though it costs more and works less efficiently in cold weather. Desiccant models typically run at 40 to 60 decibels and produce a more consistent hum rather than the cycling on-and-off of a compressor. They are also lighter and more portable than refrigerant units of the same capacity.

A whole-house dehumidifier installed in a basement, attic, or crawl space is quieter in your living areas because the motor and compressor are physically separated from where you spend time. The ducting carries the dehumidified air to the rooms you occupy, and the noise stays in the mechanical space. This option is more expensive to install but eliminates the need for a portable unit running in your bedroom or living room.

When noise is unavoidable and what to do about it

Some situations require a dehumidifier to run in a space where you spend time, and no amount of placement or adjustment will make it silent. If you are running a unit in a bedroom, consider using a white noise machine or a fan to mask the dehumidifier's sound. The fan creates a consistent background noise that makes the dehumidifier's cycling less noticeable. Some people also run the dehumidifier during the day when ambient noise is higher, then turn it off at night.

If the unit is in a shared wall with a neighbor's bedroom or living space, ask the manufacturer or retailer whether a quieter model is available in the same capacity. A 10 to 15 decibel reduction is worth the extra cost if it means avoiding noise complaints or sleep disruption. You can also run the dehumidifier on a timer set to operate during hours when noise is less of an issue.

Frequently Asked Questions

Is a dehumidifier loud enough to disturb sleep?

It depends on the model and your sensitivity to noise. A unit rated at 50 to 60 decibels on low speed is similar to a quiet refrigerator and usually does not wake most people. Units at 70 to 80 decibels are noticeably louder and may disturb light sleepers. If you plan to run it in a bedroom, choose a model under 60 decibels or place it in an adjacent closet with the door cracked open to allow air circulation.

Do dehumidifiers get louder over time?

Yes, a dehumidifier can become louder as it ages. Dust buildup on the coils and fan blades forces the motor to work harder, and worn compressor bearings develop a louder hum. Cleaning the filter monthly and having the unit serviced every few years can keep it running at its original noise level. If a previously quiet unit suddenly becomes much louder, the compressor may be failing and the unit may need replacement.

Can I soundproof a dehumidifier?

Partial soundproofing is possible. Wrapping the unit in acoustic foam or placing it inside a wooden box lined with sound-absorbing material can reduce noise by 5 to 10 decibels. However, you must may support the intake and exhaust vents remain fully open, or the unit will overheat and shut off. This method works best for units in basements or utility rooms where appearance does not matter.

What is the quietest type of dehumidifier?

Desiccant dehumidifiers are generally the quietest, running at 40 to 60 decibels. Among refrigerant models, larger units with variable-speed compressors tend to be quieter than smaller portable units because they can run at lower speeds. Whole-house systems are the quietest in living spaces because the motor is located away from occupied rooms.

Should I run my dehumidifier 24/7?

Running it continuously on low speed is often quieter and more efficient than running it intermittently on high speed. Most dehumidifiers have a humidity sensor that automatically turns the compressor off when the target humidity is reached, so the unit cycles rather than running constantly. This reduces both noise and energy use while maintaining your desired humidity level.