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Dehumidifiers

How Do I Know If I Need a Dehumidifier? A 40-pint ENERGY STAR qualified dehumidifier can save consumers roughly $20 per year. This can add up to $200 or more over the 10 year life of the unit. That’s enough to pay for the dehumidifier!

Earning the ENERGY STAR means a product meets strict energy efficiency guidelines set by the US Environmental Protection Agency and the Department of Energy. ENERGY STAR qualified models have more efficient refrigeration coils, compressors, and fans than conventional models, which means they use less energy to remove moisture.  An ENERGY STAR qualified model removes the same amount of moisture as a similarly-sized standard unit, but uses less energy — at least 10% less, and in some cases up to 23% less. You can calculate specific energy and money savings by using the dehumidifier calculator available on the ENERGY STAR Northeast Web site.

What else should I look for?
In addition to energy performance, there are many other important operating and convenience features to consider when shopping for dehumidifiers 

  • Dehumidifier Basics
  • Capacity
  • Water Removal Options
  • Placement
  • Operating Temperature
  • Relative Humidity (RH) and Humidistats
  • Energy Factor Some Other Available Features
  • Other Ways to Reduce Home Humidity
  • Further Information and Product Reviews

Remember, saving energy prevents pollution. By choosing ENERGY STAR, you are helping prevent global warming and promote cleaner air without sacrificing the product quality and performance you expect.

Dehumidifiers Purchasing & Procurement Language

What ENERGY STAR Purchasing & Procurement resources does EPA offer? ENERGY STAR Purchasing & Procurement resources include lists of qualifying products, key product criteria, drop-in procurement language and savings calculators. Organizations can use these resources to facilitate the procurement of energy-efficient ENERGY STAR products and prevent greenhouse gas emissions.  Sample Procurement Language (Download Residential Appliances Procurement Language – MS Word | 42K) The following is an example of language you may wish to require in your upcoming contract: 

The Vendor Must:

Provide dehumidifiers that earn the ENERGY STAR and meet the ENERGY STAR specifications for energy efficiency as outlined below. The vendor is encouraged to visit www.energystar.gov for complete product specifications and an updated list of qualifying products. Table 1: Criteria for ENERGY STAR Qualified Standard Capacity Dehumidifiers

  • Product Capacity (L/day) Energy Factor Under Test Conditions (L/kWh) L/day < 10  ≥ 1.20 10 ≤ L/day < 25  ≥ 1.30 25 ≤ L/day ≤ 35  ≥ 1.50 Standard Capacity Dehumidifiers: Dehumidifiers with daily water-removal capacities up to 35 Liters (74.0 US pints) Table 2: Criteria for ENERGY STAR Qualified High Capacity Dehumidifiers
  • Product Capacity (L/day) Energy Factor Under Test Conditions (L/kWh) 36 ≤ L/day ≤ 57  ≥ 2.25 High Capacity Dehumidifiers: Dehumidifiers with daily water-removal capacities up to 57 Liters (120.5 US pints)

How Do I Know If I Need a Dehumidifier?

A dehumidifier is used to remove excess moisture from the air. Some of the most common indications that you may need a dehumidifier are:

  • Wet stains on walls and ceilings
  • Stuffy feeling in a room
  • Rotting wood
  • Condensation on windows
  • Musty smells
  • Allergies (if the air in your home is too moist, it will encourage the growth of bacteria and mold, common allergens)

Dehumidifiers Product List

List Current as of July 25, 2004

Manufacturing Company NameDehumidifier TypeBrand NameModel NameModel NumberProduct Capacity (liters/day)Product Capacity (pints/day)Energy Factor
Daewoo Electronics Co., Ltd.Standard Capacity DehumidifierDaewooDHC-250DHC-25012.3261.41
Daewoo Electronics Co., Ltd.Standard Capacity DehumidifierDaewooDHC-400DHC-40020421.63
Daewoo Electronics Co., Ltd.Standard Capacity DehumidifierDaewooDHC-600DHC-60028.5601.65
De’Longhi America, Inc.Standard Capacity DehumidifierDe’LonghiDDE 400DDE 4001939.961.35
De’Longhi America, Inc.Standard Capacity DehumidifierDe’LonghiDDE 40EDDE 40E20.4643.261.74
De’Longhi America, Inc.Standard Capacity DehumidifierDe’LonghiDDE 50EDDE 50E23.8501.31
De’Longhi America, Inc.Standard Capacity DehumidifierDe’LonghiDDE 65EDDE 65E32.468.51.63
De’Longhi America, Inc.Standard Capacity DehumidifierDe’LonghiDE 40 GMDE 40 GM1939.961.35
De’Longhi America, Inc.Standard Capacity DehumidifierDe’LonghiDE 40PDE 40P18.9401.35
De’Longhi America, Inc.Standard Capacity DehumidifierDe’LonghiDE 50 GMDE 50 GM22.647.781.35
De’Longhi America, Inc.Standard Capacity DehumidifierDe’LonghiDE 50PDE 50P22.647.81.4
De’Longhi America, Inc.Standard Capacity DehumidifierDe’LonghiDH 40PDH 40P18.9401.35
De’Longhi America, Inc.Standard Capacity DehumidifierDe’LonghiDHE 90DHE 9018.438.91.38
Fedders CorporationStandard Capacity DehumidifierEmerson Quiet KoolDG50GADG50GA23.65501.4
Fedders CorporationStandard Capacity DehumidifierFeddersA7DH45B2AA7DH45B2A21.3451.64
Fedders CorporationStandard Capacity DehumidifierFeddersA7DH65B2AA7DH65B2A30.76651.77
Fedders CorporationStandard Capacity DehumidifierFeddersFDG50GAFDG50GA23.65501.4
Fedders CorporationStandard Capacity DehumidifierHampton BayHB50HB5023.65501.4
Fedders CorporationStandard Capacity DehumidifierMaytagM7DH45B2AM7DH45B2A21.3451.64
Fedders CorporationStandard Capacity DehumidifierMaytagM7DH65B2AM7DH65B2A30.76651.77
Friedrich Air Conditioning CompanyStandard Capacity DehumidifierFriedrichDehumidifierD4018.92401.36
Friedrich Air Conditioning CompanyStandard Capacity DehumidifierFriedrichDehumidifierD5023.65501.7
Friedrich Air Conditioning CompanyStandard Capacity DehumidifierFriedrichFriedrichD40A18.93401.49
Friedrich Air Conditioning CompanyStandard Capacity DehumidifierFriedrichFriedrichD50A23.66501.56
Friedrich Air Conditioning CompanyStandard Capacity DehumidifierFriedrichFriedrichD65A30.76651.54
Friedrich Air Conditioning CompanyStandard Capacity DehumidifierFriedrichFriedrichD65B30.76651.56
GE AppliancesStandard Capacity DehumidifierGEAHG40AHG40FCG119.5941.421.36
GE AppliancesStandard Capacity DehumidifierGEAHG40AHG40FDG119.5941.421.36
GE AppliancesStandard Capacity DehumidifierGEAHG40AHG40LBG118.93401.3
GE AppliancesStandard Capacity DehumidifierGEAHG40AHG40LCM11939.931.36
GE AppliancesStandard Capacity DehumidifierGEAHG40AHG40LDM11939.931.36
GE AppliancesStandard Capacity DehumidifierGEAHG50AHG50LBG123.66501.7
GE AppliancesStandard Capacity DehumidifierGEAHG50AHG50LCG124.5651.931.69
GE AppliancesStandard Capacity DehumidifierGEAHG50AHG50LDG12450.711.66
Haier AmericaStandard Capacity DehumidifierHaierHD30115.14321.34
Haier AmericaStandard Capacity DehumidifierHaierHD45121.3451.71
Haier AmericaStandard Capacity DehumidifierHaierHD451E21.3451.71
Haier AmericaStandard Capacity DehumidifierHaierHD60128.4601.88
Haier AmericaStandard Capacity DehumidifierHaierHD601E28.4601.88
Heat Controller Inc.Standard Capacity DehumidifierComfort-AireComfort-AireCAM-25x11.8251.3
Heat Controller Inc.Standard Capacity DehumidifierComfort-AireComfort-AireCAM-40x19401.5
Heat Controller Inc.Standard Capacity DehumidifierComfort-AireComfort-AireCAM-60x28.4601.5
Heat Controller Inc.Standard Capacity DehumidifierComfort-AireComfort-AireD-50123.6501.39
Heat Controller Inc.Standard Capacity DehumidifierComfort-AireComfort-AireHD-45121.3451.4
Heat Controller Inc.Standard Capacity DehumidifierComfort-AireComfort-AireHD-65130.8651.65
Heat Controller Inc.Standard Capacity DehumidifierComfort-AireBHD-501x23.6501.56
Heat Controller Inc.Standard Capacity DehumidifierComfort-AireBHD-651x30.8651.54
LG Electronics, Inc.Standard Capacity DehumidifierGoldStarDH40DH4019401.49
LG Electronics, Inc.Standard Capacity DehumidifierGoldStarDH4010EDH4010E18.92401.31
LG Electronics, Inc.Standard Capacity DehumidifierGoldStarDH40EDH40E19401.49
LG Electronics, Inc.Standard Capacity DehumidifierGoldStarDH50DH502450.51.56
LG Electronics, Inc.Standard Capacity DehumidifierGoldStarDH50EDH50E2450.51.56
LG Electronics, Inc.Standard Capacity DehumidifierGoldStarDH50ELDH50EL2450.51.56
LG Electronics, Inc.Standard Capacity DehumidifierGoldStarDH65EDH65E31651.54
LG Electronics, Inc.Standard Capacity DehumidifierGoldStarDH65ELDH65EL31651.54
LG Electronics, Inc.Standard Capacity DehumidifierGoldStarDHA4511MRDHA4511MR21.28451.58
LG Electronics, Inc.Standard Capacity DehumidifierGoldStarDH400E19401.36
LG Electronics, Inc.Standard Capacity DehumidifierGoldStarDH400M19401.36
LG Electronics, Inc.Standard Capacity DehumidifierGoldStarDH404E19401.36
LG Electronics, Inc.Standard Capacity DehumidifierGoldStarDH504EL24511.56
LG Electronics, Inc.Standard Capacity DehumidifierGoldStarGD40E19401.36
LG Electronics, Inc.Standard Capacity DehumidifierKenmore258402584018.92401.31
LG Electronics, Inc.Standard Capacity DehumidifierKenmore258412584118.92401.31
LG Electronics, Inc.Standard Capacity DehumidifierKenmore580.524502580.5245020021.29451.58
LG Electronics, Inc.Standard Capacity DehumidifierKenmore580.535013580.535013002450.51.56
LG Electronics, Inc.Standard Capacity DehumidifierKenmore580.535093580.535093002450.51.56
LG Electronics, Inc.Standard Capacity DehumidifierKenmore580.536502580.5365020030.75651.73
LG Electronics, Inc.Standard Capacity DehumidifierKenmore580.537013580.537013003369.51.56
LG Electronics, Inc.Standard Capacity DehumidifierKenmore580.543514001735.91.3
LG Electronics, Inc.Standard Capacity DehumidifierKenmore580.5450140024501.56
LG Electronics, Inc.Standard Capacity DehumidifierKenmore580.5470140033701.6
LG Electronics, Inc.Standard Capacity DehumidifierLGDHE-4031DHE-403119401.49
LG Electronics, Inc.Standard Capacity DehumidifierLGDHR-4030DHR-403019401.49
LG Electronics, Inc.Standard Capacity DehumidifierLGDHR-5030DHR-50302450.51.56
LG Electronics, Inc.Standard Capacity DehumidifierLGLD4019401.36
LG Electronics, Inc.Standard Capacity DehumidifierLGLD40E19401.36
LG Electronics, Inc.Standard Capacity DehumidifierLGLD50EL24511.56
LG Electronics, Inc.Standard Capacity DehumidifierLGLD65EL31651.54
Midea Refrigeration Equipment Co., LtdStandard Capacity DehumidifierMideaMDB-12AEMDB-12AE1225.371.45
Midea Refrigeration Equipment Co., LtdStandard Capacity DehumidifierMideaMDB-19AEMDB-19AE1940.171.65
Midea Refrigeration Equipment Co., LtdStandard Capacity DehumidifierMideaMDB-24AEMDB-24AE2450.741.75
Midea Refrigeration Equipment Co., LtdStandard Capacity DehumidifierMideaDHC-25012.3261.41
Midea Refrigeration Equipment Co., LtdStandard Capacity DehumidifierMideaDHC-40020421.63
Midea Refrigeration Equipment Co., LtdStandard Capacity DehumidifierMideaDHC-60028.5601.65
Midea Refrigeration Equipment Co., LtdStandard Capacity DehumidifierMideaMDB-25AEN312.3261.41
Midea Refrigeration Equipment Co., LtdStandard Capacity DehumidifierMideaMDB-40AE20421.63
Midea Refrigeration Equipment Co., LtdStandard Capacity DehumidifierMideaMDB-45AE20.8441.72
Midea Refrigeration Equipment Co., LtdStandard Capacity DehumidifierMideaMDB-60AE28.5601.65
Midea Refrigeration Equipment Co., LtdStandard Capacity DehumidifierMideaMDB-65AE29.8631.8
Therma-Stor ProductsHigh Capacity DehumidifierTherma-StorSanta FeNULL47.9101.212.75
Therma-Stor ProductsHigh Capacity DehumidifierTherma-StorSanta Fe RxNULL40.7862.5
W.C. Wood Company, Inc.Standard Capacity DehumidifierCrosleyMillenniumMCR40$18.9401.31
W.C. Wood Company, Inc.Standard Capacity DehumidifierCrosleyMillenniumMCR40ES19401.31
W.C. Wood Company, Inc.Standard Capacity DehumidifierCrosleyDCW40$18.9401.31
W.C. Wood Company, Inc.Standard Capacity DehumidifierEdisonDHE40S18.9401.31
W.C. Wood Company, Inc.Standard Capacity DehumidifierEdisonEMD40ES18.9401.31
W.C. Wood Company, Inc.Standard Capacity DehumidifierEdisonEMD40S18.9401.31
W.C. Wood Company, Inc.Standard Capacity DehumidifierWoodsWD20W9.3201.21
W.C. Wood Company, Inc.Standard Capacity DehumidifierWoodsWD36G16.8361.31
W.C. Wood Company, Inc.Standard Capacity DehumidifierWoodsWMD20W9.3201.21
W.C. Wood Company, Inc.Standard Capacity DehumidifierWoodsWMDE40W18.9401.31
Whirlpool CorporationStandard Capacity DehumidifierWhirlpoolBasement DehumidifierAD40USL18.9640.11.3
Whirlpool CorporationStandard Capacity DehumidifierWhirlpoolBasement DehumidifierAD50USL23.750.111.35
Whirlpool CorporationStandard Capacity DehumidifierWhirlpoolBasement DehumidifierAD65USL30.8165.141.85
Whirlpool CorporationStandard Capacity DehumidifierWhirlpoolStandard DehumidifierAD40DSL18.9640.091.3
Whirlpool CorporationStandard Capacity DehumidifierWhirlpoolStandard DehumidifierAD50DSL23.750.111.35
Whirlpool CorporationStandard Capacity DehumidifierWhirlpoolUltra Low Temp. Basement DehumidifierAD65USM30.81651.65

Dehumidifier Basics

Capacity Dehumidifier capacity is usually measured in pints per 24 hours and is determined by two factors: the size of the space that needs to be dehumidified and the conditions that exist in the space before dehumidification. Use the chart below to estimate the capacity you are looking for, or use the dehumidifier calculator  available on the ENERGY STAR Northeast Website. 

Condition without Dehumidification Area (Sq. Feet) 500 1,000 1,500 2,000 2,500

  • Moderately Damp (space feels damp and has musty odor only in humid weather) 10 14 18 22 26
  • Very Damp (space always feels damp and has musty odor. Damp spots show on walls and floor.) 12 17 22 27 32
  • Wet (space feels and smells wet. Walls or floor sweat, or seepage is present.) 14 20 26 32 38
  • Extremely Wet (laundry drying, wet floor, high load conditions.) 16 23 30 37 44 Source: Association of Home Appliance Manufacturers (AHAM)

Water Removal Options Most dehumidifiers use a removable plastic bucket and warning lights to indicate when the bucket is full and needs to be emptied. There is typically an automatic shutoff when the bucket is full, so you won’t have to worry about the bucket overflowing. Most dehumidifiers come with a fitting that allows you to hook a hose directly to the bucket, which can then be directed into a floor drain or sump pump, so there is no need to empty it.

Placement Most dehumidifiers have top-mounted air discharge and can be placed against walls, but if you do not have top-mounted discharge, make sure the dehumidifier is located away from walls and furniture, so that air can circulate freely around the unit. This will result in better operation of the product.  Doors and windows to the space being dehumidified should be closed while the unit is running. This will ensure that the space is dehumidified as efficiently as possible. 

Locate away from sources of dust and dirt (like woodworking equipment), which can clog coils and grills. Observe all manufacturer warnings regarding electrical safety. In particular, never set up water drainage or disposal near electrical circuits or devices. Make sure the dehumidifier is connected to a properly grounded outlet. Keep drain hoses away from electrical cords and connections. If you are planning to use a hose to drain the dehumidifier’s water bucket, make sure the unit is located near enough to the floor drain or sump to avoid the need for a long and unwieldy hose. Don’t create a tripping hazard! Do not be alarmed if the air temperature directly around the unit is warmer than in surrounding areas. As a dehumidifier removes moisture from the air, it slightly warms the space around it.

Operating Temperature If the space being dehumidified has temperatures that typically fall below 65 degrees (F), you may want to consider buying a product that is specified for use at lower temperatures. Frost can form on the condensing coils if the air temperature drops below 65 degrees, and may negatively affect the performance of the product by causing the compressor to cycle on and off repeatedly without removing moisture from the air. If this happens, the unit should be switched off and allowed to defrost before it is turned back on.

Some dehumidifiers come with an antifrost sensor, which will automatically turn the unit off if the air temperature drops below a certain point. Qualified ENERGY STAR models are available that are rated for use at temperatures as low as 42 degrees.

Relative Humidity (RH) and Humidistats Humidity, the amount of moisture or water vapor in the air, is most often talked about in terms of Relative Humidity (RH). RH is the amount of water vapor actually present in the air compared to the greatest amount of water vapor the air can hold at that temperature. The optimum RH level for a building is generally considered to be between 30% and 50%. Anything above this range may promote bacteria growth. (In colder climates, during the heating season, humidity levels should be in the range of 30% to 40% RH to prevent window condensation.)  Many dehumidifiers include a built-in humidistat, a device that allows you to set the desired RH level that you would like for the room. Once the room reaches the desired RH level, the dehumidifier will cycle on and off automatically to maintain the level.

If your dehumidifier does not have a built-in humidistat, or has a humidistat that does not show RH levels purchase a hygrometer (a gauge that measures relative humidity) separately and hang it near the dehumidifier. The hygrometer will measure RH levels, and enable you to monitor when to turn the dehumidifier on and off.

Energy Factor The energy efficiency of dehumidifiers is measured by its energy factor, in liters of water removed per kilowatt-hour (kWh) of energy consumed or L/kWh. In general, a higher energy factor means a more efficient dehumidifier.

Energy factors can be found on the product list (Excel). 

Other Features

Other Available Features Various performance and convenience features are available on dehumidifiers, which may add to their purchase price. ENERGY STAR does not endorse any of the features below, but provides this information to help you select the best product for your individual needs.

A Timer will enable you to control the cycling of the dehumidifier, and set it to turn on at night. This may save you money on electricity bills, by taking advantage of off-peak electric rates.

A Washable Air Filter will allow you to easily remove and clean the filter, so that the dehumidifier does not become clogged with dust and dirt and operate less efficiently. Additionally, the unit’s coils should also be regularly vacuumed or dusted, so that dirt does not build up there, either.

A Pause button enables you to stop the dehumidifier for a pre-set short period of time if the sound from the dehumidifier interferes with a nearby activity.

A Built-in Condensate Pump, which takes water from the dehumidifier’s water storage bucket and pumps it directly out of a window or into a sink for draining can be a big time-saver. This feature means you would never have to worry about the dehumidifier turning off automatically due to a full bucket, nor would you have to manually empty the bucket. (The advantage of a condensate pump over a hose for drainage is that the hose would be reliant on gravity, so it would require careful placement to ensure proper drainage into a floor drain or sump.)

Multiple Fan Speeds will mean that you have the choice of running the dehumidifier at a higher speed, which is generally more efficient or a lower speed, which is quieter. If you plan to move your dehumidifier around, look for one with an easy-to-use carrying handle and/or wheels. This will make transportation of the unit a lot easier!

Other Ways to Reduce Home Humidity

Reducing sources of moisture can reduce your need for dehumidification. • Improving the drainage around the foundation of your home may result in decreased humidity in your basement. Some ways to improve drainage are:

  • Extend downspouts from your gutters away from the foundation of your home
  • Keep gutters and downspouts clear and open
  • Ensure that the soil slopes away from your foundation, to avoid pooling of water around your home
  • Avoid over-watering of foundation plantings
  • Ensure that clothes dryers are properly vented to the outdoors. If you do not use a clothes dryer, dry your clothes outdoors as opposed to hanging them inside for drying.
  • Use vent fans in bathrooms and kitchens to remove humidity at the source.
  • Repair leaking outdoor faucets. Not only will this help reduce humidity, but it will also save you money on your water bills!
  • If your home uses central air conditioning, consider installing an A/C vent in the humid space in your home and take advantage of the dehumidifying capabilities of your A/C system. This will also help with air circulation, improving airflow between humid parts of your home and drier parts.

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