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Quest Dual 155 Pint Overhead Dehumidifier

Item #: 700818

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Quest Dual 155 Pint Overhead Dehumidifier

Additional Images


Water Removal Rate


Energy Source



Pints Per

Kilo Watt Hour

Mev 11




UL Rated
ETL Listed

Cord Length


Energy Star

Worlds Most Efficient Dehumidifiers!

Quest Dual 155 was designed to be placed overhead and out of the way, but can also be placed at ground level for plug and play operation.

It is designed to be very energy efficient. The Quest 155 performs at 7.3 pints per kilowatt-hour. Compared to most standard dehumidifiers (3.8 pints/kWh), the Quest 155 is nearly twice as efficient.

The Quest Duals horizontal configuration, patent pending dual outlet design and insulated cabinet for quieter operation enable their exceptional performance in almost any application. The Quest Duals are plug-n-play, requiring no installation.

Optional condensate pump and ducting kits provide the ultimate in flexibility for the most challenging space restrictions and specialized applications. MERV-11 filtration is standard on these units, capturing particles (including mold spores) down to 1 micron in size.

Quest Equipment Provides:

  • The Most Energy-Efficient Dehumidifiers on the Market
  • High Capacity, High Quality Dehumidifiers With Superior Air Filtration
  • The Most Complete Humidity Control Product Line
  • Superior U.S. Technical Support and Service
  • A Full Warranty on Every QUEST Product
  • Patented Technology developed in Madison, Wisconsin

Quest Dual 155

  • 155 pints, 8.0 amps, 115V, 7.3 pints/Kwh
  • Made in the USA - Built to Last
  • Energy Star Leading Performance (no dehumidifier is more efficient)
  • UL Rated, ETL Listed - the highest safety standard
  • MERV 11 Filtration - captures dangerous airborne particles
  • 10 Cord - plugs into a standard 115V outlet
  • 5 Year Powertrain Warranty
  • Flexible Controls - never need to be reset
  • Plug and Play or Overhead Installation
  • Ductable - intake and dual exhausts (kits available)

Made in the USA.


Brand Quest
SKU 700818
Weight (lb.) 140
Length (in.) 42
Width (in.) 24
Height (in.) 28.25
Warranty Yes
Free Shipping Yes
UPC 859029004229
UL Listed Yes
ETL Listed Yes
Dehumidifier Type Commercial
Efficiency 7.3 Pints/kWh
Dehumidifier Features Adjustable Humidistat, Adjustable Fan Speeds, Includes Drain Hose, Auto Restart
Cord Length 10 Ft.
Amps 8A
Watts 920
Voltage 115V
ENERGY STAR Certified Yes

Quest Dual 155 Pint Overhead Dehumidifier Videos

Quest Dual 155 Pint Overhead Dehumidifier Questions & Answers

How do I size a dehumidifier for a grow room?
Plants transpire about 97% of the water they receive, so the amount of water your plants consume is approximately the amount that needs to be removed each day. For example, 30 plants each receiving ½ gallon per day is an average of 15 gallons water per day. Every gallon of water is 8 pints. This example works out to 120 pints per day.

Isn’t my air conditioner a dehumidifier?
Yes, but there are issues with this solution.
1. Air conditioners remove water only when they are running. In most cases when the grow lights are off, the air conditioner is off as well. Lights-off time is when humidity is most problematic.

2. Using an air conditioner to dry a room will overcool the room, potentially causing plant stress. This will also use a significantly greater amount of energy than a Quest commercial dehumidifier.

3. The more energy efficient the air conditioner, the less moisture it actually removes. An efficient air conditioner is a terrible dehumidifier.

4. The re-heat method. Some air conditioners offer an optional heating coil as a dehumidification option. Essentially, by adding artificial heat to the room, the air conditioner is forced to operate when the lights are off and thus the air conditioner removes water. While this method works, and can be used in a pinch, it’s a poor long term solution and will use 4-8x the energy as a Quest dehumidifier. 4-8x the energy use is roughly equal to $5,000-$25,000 per year in unnecessary energy consumption.

What if I live in Arizona, New Mexico or a dry state, do I need a dehumidifier?
While it may be dry outdoors, growing in a sealed environment changes things a good bit. Growers using sealed rooms, even in the driest of outdoor climates, almost always require dehumidifiers. The higher quality of the grow room design and construction, the more critical a dehumidifier will be.

What is the ideal humidity?
Because every plant is different, it is hard to pick just one number. However, most research indicates that 45-55% RH is the safe zone where plants are healthy, spore germination is unlikely, and pests find the environment unappealing.

How much money does a Quest dehumidifier save me in electricity?
Quest is the leader in energy efficiency and one of our models is the most energy efficient dehumidifier ever built. Depending on the model, Quest dehumidifiers can save commercial growers $100-$200 a month in electricity per unit. That’s $1,200-$2,500 per dehumidifier per year.

Can the water be reused?
Yes, Quest dehumidifiers produce neutral pH, very low TDS water. This water is safe for all plants, even consumable ones.

Customer Reviews

Best brand on the market Review by Nick D
I made the mistake of not getting a big enough unit from the start, but ended up being able to sell the small on to a buddy and got this bad boy, and wow am I happy! Great unit, and no more moldy flowers! Never again, what a mess that was.

(Posted on January 12, 2017)
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