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The Quest Dual 155 is one of the most energy-efficient overhead type dehumidifiers on the market today. Removing 155 ppd (pints per day, 71L), the Dual 155 can save you thousands a year compared to the competition. Best of all the Dual 155 can pay for itself giving you years and years of 24/7 trouble free operation.

Quest De-Humidifiers are essential for maintaining optimum humidity levels in a cultivation facility. This prevents issues with mould and disease, and allows for enhanced plant growth. Quest units are a staple in medical-grade cultivation facilities around the world. 

Like all Quest products, the Dual 155 is made in the USA using the very best components and materials available. Every one of our dehumidifiers comes with a 5 year warranty.

Quest has the most energy-efficient dehumidifiers available, using the least electricity and removing more pints of water per kWh at the widest temperature range. Quest’s innovative design also creates the lightest heat load on your HVAC, paying for itself in energy savings.


With overhead mount capability, Quest lets you maximize your grow space—and profits.


Made in Madison, WI, Quest meets or exceeds the highest standards (ETL listed/ UL certified). Plus, it’s backed by an industry-leading warranty.

Quest dehumidifiers will e ciently control humidity from germination to harvest, maintaining a growing environment that’s vital to the success of indoor and hydroponic gardening.

Protect your investment, your plants and your profits with Quest.

Dehumidifier capacities are at the standard American rating condition of 80ºF and 60%RH.

  • Blower: 415CFM @ 0.0 mmWG
  • Power: 800 Watts @ 26.67°C and 60% RH Supply Voltage: 230VAC - 1 phase - 50 Hz
  • Current Draw: 3.5 AMPS
  • Energy Factor: 3.74 L/kWh
  • Operating Temp.: 7.22°C Min., 35°F Max.
  • Minimum Performance at 26.67°C and 60% RH
  • Water Removal: 71 L/Day
  • Efficiency: 3.73 L/kWh
  • Air Filter: MERV-11
  • Filter Size: 40.64 cm x 50.8 cm x 5.08 cm
  • Drain Connection: 3/4" Threaded MPT Unit 
  • L: 96.5 cm
  • H: 55.3 cm
  • W: 51.4 cm
  • Weight: 61 kg
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