Noise Output


To determine whether any particular dehumidifier should be considered to be “quiet” or “loud” we performed four different noise output tests. The first test involved placing our sound level meter right above the unit’s control panel on high fan speed. For the second test we again placed the sound meter above the control panel, but this time set the dehumidifier to low fan speed.

For the third and fourth test we placed the sound meter 10 feet away from the dehumidifier to record noise output levels. For the third test the dehumidifier was set to the high fan speed setting and for the fourth test the unit was again set to the low fan speed setting at the same distance.

So in summary:

Test 1: sound meter right above unit’s control panel – high fan speed
Test 2: sound meter right above unit’s control panel – low fan speed
Test 3: sound meter 10 ft. away from unit – high fan speed
Test 4: sound meter 10 ft. away from unit – low fan speed

The first two tests allowed us to determine the unit’s noise output at close range while the second two tests allowed us to make the same determination at a range we felt was more indicative of a real world environment. In fact, our recommendation is that you focus on each unit’s performance in our 10 foot test much more than you do on our close range testing (we do the same in our product reviews).

Intake/Exhaust Location

Before we show you the results of our testing we need to discuss the sizable advantage certain units had in each noise output test we performed. All dehumidifiers intake air and exhaust air. The wind noise produced when air comes into the dehumidifier or is exhausted out of the dehumidifier, in addition to any compressor noise, are the primary culprits responsible for dehumidifier noise.

The location of the exhaust is especially important since most of the noise produced by a dehumidifier comes from the exhaust. Here’s the thing: those units that exhausted out of the top of the dehumidifier had a distinct disadvantage compared to those units that exhausted out of the side in our testing. This is especially true for the tests that were carried out at the dehumidifier’s control panel.

The noise produced by the side exhaust units was directed to the side of the unit, away from the sound meter’s location – the result was a relatively lower reading. The noise produced by the top exhaust units was directed above the dehumidifier, much closer to the sound meter’s location – the result was a relatively higher reading. While this disadvantage was more pronounced during the control panel tests, it was still present during long range testing.

So in summary,

Most dehumidifier noise is wind noise generated by the dehumidifier’s fan. The noise emanates from two parts of the dehumidifier:

Where air is taken into the dehumidifier: either on the front of the unit (most models) or the back of the unit (very few models but notably all of the latest Frigidaire models).

Where air is exhausted out of the dehumidifier: either on the top of the unit or on the side of the unit.

Our testing favors units that exhausted out of the side of the dehumidifier since the sound meter was placed towards the top of the dehumidifier and not the side.

Keep this information in mind as you study the comparison charts below.

You can sort the table below by clicking on the up/down arrows next to each column heading. Clicking on the down arrow next to “far high fan”, for example, will sort the dehumidifiers we tested from most quiet to least quiet in the noise output test where we placed the sound meter 10 ft away from the dehumidifier while it was on high fan speed. Clicking on the up arrow will reverse the list sorting the same units from least quiet to most quiet.

70 Pint Dehumidifier Noise Output

Manufacturer and Model
CP High Fan
CP Low Fan
10 ft High Fan
10 ft Low Fan
Frigidaire FFAD7033R161.257.252.948.8
Keystone KSTAD70B58.255.949.948.1
Danby DDR70A2GP73.671.554.850.8
Honeywell DH70W71.966.553.350.1
RCA RDH70558.855.949.747.8
GE ADEL70LR71.568.555.652.8
Haier DE65EM71.067.854.252.9
Kenmore KM7059.35751.449.9
Whirlpool AD70GUSB61.958.453.651.1
Hisense DH-70KP1SLE67.564.152.149.7
Friedrich D70BP73.167.755.451.1
SPT SD-72PE59.657.4
Haier HM70EP73.670.656.653.3
Delonghi DD70PE72.166.254.851.7

50 Pint Dehumidifier Noise Output

Manufacturer and Model
CP High Fan
CP Low Fan
10 ft High Fan
10 ft Low Fan
Frigidaire FFAD5033R161.9
Keystone KSTAD50B60.257.451.948.8
Friedrich D50BP68.761.851.147.3
Delonghi DD50PE68.763.353.651.4
SPT SD-52PE 58.255.451.748.6

30 Pint Dehumidifier Noise Output

Manufacturer and Model
CP High Fan
CP Low Fan
10 ft High Fan
10 ft Low Fan
Frigidaire FFAD3033R162.155.453.346.1
Hisense DH-35K1SJE575.171.558.255.9
GE ADEL30LR73.367.154.849.7
Haier DM32M-L73.170.956.153.3

Important Notes

#1 All readings are in decibels. “50.2″ = a sound meter reading of 50.2 dB

#2 “CP” = control panel = sound meter reading right above the dehumidifier’s control panel

#3 “10 ft” = sound meter reading 10 ft from the dehumidifier’s location.

#4 Lower readings are better. For example, a dehumidifier producing 50 dB of noise is quieter than a dehumidifier producing 60 dB of noise.

#5 Side exhaust units are the Frigidaire 70 pint unit, the Keystone 70 pint unit, the RCA 70 pint unit, the Whirlpool 70 pint unit, the Kenmore 70 pint unit, the SPT 50 and 70 pint units, and the Hisense 30 pint unit. As we discuss above, these units had a distinct advantage in all noise output tests.

Our Recommendation

Based on the data above and considering other important dehumidifier features as well, our recommendation for the best quiet dehumidifier is also the #1 recommended dehumidifier – the Frigidaire FFAD7033R1.


  1. Jay Kavanaugh says

    Why don’t you say whether these have a continuous drain option? Surely that’s the first thing you need to know if you’re buying a dehumidifier.

  2. Jane says

    We want a central dehumidifier system without having central air conditioning. We do not like AC and love having all of our windows open as much as possible, even when it rains, as long as it’s not coming in. But our house has become so damp this summer. Nothing ever dries and our bed linens feel almost damp. We have a noisy old dehumidifier in basement. Is our only option to have units upstairs as well? Master bedroom is 180sqft. Thank you, Jane from Ithaca, NY

  3. mike says

    Frigidair FFAD7033R1 (without built in pump) has low noise level and performs well. Does Frigidair FFAD7033T1 (with built in pump) do the same? My home is of 2500 sqft, morderatly damp. Could you advise which one to go?
    Thank you,

  4. philip harding says

    Hi, we live in kefalonia in a large 3 bedroom apartment, constructed of concrete floors and ceiling with block wall, no isulation, what would be a good buy dehumidifier that is quite, energy efficiant and say 15 ltrs a day.

  5. Holly Hoskison says

    Could you recommend me a dehumidifier? Student room, top floor, to help avoid mould growing when drying washing. Quieter the better. Thanks

  6. Marc says

    I live at 8,500′ elevation in a modern 3,000sf (1st & 2nd dfloor), 100% concrete house plus 1509sf lower area that is open to upper area (no door) in Lerma, estafe de México, México. The exterior temperature never goes below 32 F or above 82F. The rainy season is during the summer. Outside temps are really the same as winter except the nighttime temp only goes to 45-55F. As the rainy season ends is when our mold/mildew problem exists. We don’t use a/c or heat. nice! Low Noise and energy effiiceiemcy is very important. What size, Mgr and model would be the best for our whole house?

    • Anonymous says

      Our situation here in Ithaca, NY is we hate air conditioners & on hottest days, fans are sufficient. We love keeping all windows open. But in the summer, nothing dries & our bed linens feel almost damp. We obviously need a humidifier but want a central dehumidifier system without central air. Please tell me it’s possible.

  7. Duncan Tsang says

    I am confused, without a Rating Scale, all 12 Legend can be very subjective. Can you send me the Rating Scale to look into ?

    E.g. Noise Output of Danby ddr70a2gp is rated 3; but Haier-HM70EP is 2, the readings have small differences (I understand), but in the absent of the Scale, it just not very helpful.

    70 Pint Dehumidifier Noise Output
    Model NO Rating CP High Fan CP Low Fan 10 ft High Fan 10 ft Low Fan
    DDR70A2GP 3 73.6 71.5 54.8 50.8
    HM70EP 2 73.6 70.6 56.6 53.3

    • Admin says

      The rating rubric we use to give the dehumidifier a score out of 5 in each review category, including noise output, can be found about halfway down this page.

Leave a Reply to Admin Cancel reply

Your email address will not be published.