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Quest Dual 155 Overhead Dehumidifier

In stock


Contact us at [email protected] or (707) 588-8844 for freight quote.

Quest Dual 155 Overhead Dehumidifier

Contact us at [email protected] or (707) 588-8844 for freight quote.

The Quest Dual 155 is one of the most energy-efficient commercial dehumidifiers on the market today. Removing 155 pints of water per day, this unit can save you thousands in energy costs every year compared to the competition. It gives you the flexibility to hang the unit overhead or use ductwork and keep the dehumidifier in a different space entirely.

MERV 11 Filtration

Captures dangerous airborne particles


Intake and exhaust kits are available

UL Rated And ETL Listed

The highest safety standard

High Efficiency Performance

No dehumidifier is more efficient

Insulated Cabinet

For quieter operation


Quest Duals require no installation

Overhead Or Ground Placement

Built to fit what works for your space

Made in the USA

Built to last

Avoid mold and mildew that causes plant rot and structural damage in commercial areas with the Quest Dual 155 Overhead Dehumidifier. This unique low-amp dehumidifier is capable of removing up to 155 pints of water per day (AHAM) in facilities.

Commonly used in small growing spaces, warehouses, and other commercial areas, it's incredibly easy to set up with the Plug & Play feature and an onboard dehumidistat for consistent humidity monitoring and control. You can also wire up to 6 units together, use various types of ducting or non-ducting installation, and efficient design for low-cost dehumidifying.

Out-of-the-Way Installation

Install the Quest 155 in a variety of different options. Here are some solutions for installation:
  • Overhead:

    Conveniently hang your Quest 155 out of the way for more growing space with the overhead installation using Quest hanging brackets. With the dehumidifier out of the way on the floor, you’re free to use the existing space for more growing capacity. Simply install the overhead dehumidifier with the additional hanging brackets for the Quest 155 and secure with chains.
  • Ducting:

    Additional ducting can be added to the dual exhaust vents. Add Quest supply collars and return collars to add healthy air to different rooms.
  • Ground:

    Growers may opt to install the dehumidifier on the floor of the room. This option allows growers to access the control panel and onboard dehumidistat for day-to-day use.

To further increase flexibility in where your dehumidifier can be installed, we suggest adding a Quest Universal Condensate Pump, which can be mounted directly to the unit.

Onboard Dehumidistat: Automatic Humidity Control & Monitoring

Humidity monitoring is now in your control with the onboard dehumidistat. The onboard dehumidistat allows you to preset your ideal conditions with three presets – dry (20% - 30% RH), normal (50% RH), and humid (80% - 90% RH). If the humidity rises above your preset, the dehumidistat will automatically kick on the unit, running until the humidity drops at least 4% - 6% and turning off.

To conserve energy, the Quest 155 is constructed with air-to-air heat exchange, which makes this unit an efficient option as well.

Ducting Options

As with any dehumidifier, the Quest 105 can be ducted to suit an indoor grower. For optimal performance, no ducting is recommended for the dehumidifier. However, there are other options for ducting:
  • No Ducting:

    Capture humid air and release dry air without the use of ducts.
  • Ducted Return & Supply:

    For optimal drying, duct humid air into the inlet and release dry, warm air into the surrounding area through the dual outlets.
  • Remote Area, Ducted Supply:

    Return dry air back into your growing space by drawing warm, humid air into the unit in the same space as the dehumidifier.
  • Remote Area, Ducted Return Only:

    Release dry air back into the remote or isolated area where the dehumidifier is located, and duct in humid air through the inlet.

Additional Features:

  • Daisy Chain Option:

    Wire up to six of these models together for use in large warehouse spaces. All six will be running off the same sensor on the Quest DEH 3000 R, so all models must be in the same room.
  • Fan Only Runs When Dehumidifying:

    The fan only runs when the compressor is running and the unit is dehumidifying.
  • Air-to-Air Heat Exchanger:

    Cooled, dehumidified air helps cool incoming air, reducing energy output.
  • Operation Temperature:

    Operates in temperatures between 56°–95° F.
  • Cool & Humid Conditions:

    The unit will continue to operate even when it is cool or humid outside.
  • Gravity Drain:

    Can be drained via gravity drain to an outside source or acceptable indoor drain.
  • MERV 11:

    Uses a standard MERV 11 filter.
  • Auto Restart:

    During a power outage, the unit will automatically resume operation.
  • Simple Wiring:

    Featuring a low voltage terminal block, the Quest 155 is simple to wire to an external control such as the Honeywell H46C 1166 Wall Mounted Humidistat.


More Information
SKU cc_ac_103
UPC 859029004229
Manufacturer Part Number 4031490
Distributor Part Number HGC700818, 700818