Quest 506 Overhead Dehumidifier — Green Thumb Depot
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Quest 506 Overhead Dehumidifier

Quest 506 Overhead Dehumidifier

by Quest
SKU: 7689
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The Quest 506 Overhead Dehumidifier is a top-tier, industrial-grade moisture control solution, designed for exceptionally large and demanding environments. This formidable unit has the capacity to remove an astounding 506 pints of moisture per day, making it perfectly suited for vast spaces such as large-scale commercial grow operations, extensive warehouse facilities, or major industrial settings. Its overhead installation design is a strategic advantage, allowing for efficient space utilization while ensuring comprehensive and effective dehumidification throughout the area. The Quest 506 is renowned for its energy efficiency, which is a critical feature in reducing operational costs and environmental impact, especially in settings where continuous, high-volume dehumidification is required. Built to withstand the rigors of heavy-duty use, it features robust construction and intuitive controls, making it a durable and user-friendly option. The Quest 506 Overhead Dehumidifier stands out as an ideal choice for those who require a powerful, efficient, and space-saving solution to tackle the challenges of excessive humidity in large-scale environments.

Quest 506 Pint Overhead Dehumidifier

Elevate large-scale indoor growing or commercial spaces with the Quest 506 Overhead Dehumidifier—a pinnacle of energy efficiency and high-capacity performance. Removing an impressive 506 pints daily, it's among the most powerful and efficient commercial dehumidifiers. Engineered in Madison, Wisconsin, with a 5-year warranty and California Title 24 compliance. Patented multi-coil technology ensures market-leading efficiencies, while low amp draw reduces heat output and conserves electricity. Ideal for agriculture, distribution, logistics, sports, and recreation facilities, the Quest 506 enhances productivity and safeguards your investment.

Product Overview



What's Included?

Warranty Policy

Product Overview

Invest in success with Quest Dehumidifier for energy-efficient indoor grow operations. Its innovative design minimizes HVAC heat load, ensuring rapid ROI. Combat threats like powdery mildew and bud rot with Quest's proper sizing, placement, and airflow control options. Whether in a greenhouse or hydroponic system, Quest provides flexible and customizable solutions for optimal conditions and crop protection.

Quest: Pioneering Energy-Efficient Dehumidifiers for Optimal Performance

Quest leads the market with the most energy-efficient dehumidifiers, offering high capacity, superior air filtration, and a comprehensive humidity control product line. Renowned for top-quality solutions, Quest ensures optimal conditions for various applications and provides superior U.S. technical support. Every Quest product comes with a full warranty, showcasing the brand's commitment to quality and customer satisfaction. With innovative patented technology developed in Madison, Wisconsin, Quest is a trusted name for unparalleled efficiency and technical excellence in dehumidification.

Energy Efficiency

High Capacity and Quality

Smart Technology

Superior Air Filtration

Comprehensive Product Line

U.S. Technical Support and Service

Full Warranty

Patented Technology


Quest sets the industry standard by providing the most energy-efficient dehumidification solutions, a feat achieved through our exclusive patented multi-coil design, known as M-CoRR (Multi-Coil Refrigeration Recovery). This groundbreaking technology is unique to Quest, setting our dehumidifiers apart from the competition.

M-CoRR is meticulously engineered for maximum performance, positioning Quest as the pinnacle of energy efficiency and offering the best return on investment.

The technology's innovative design excels across a broad spectrum of dew points, even in colder temperatures, and maintains optimal capacity regardless of fluctuations in airflow. This ensures that Quest dehumidifiers not only stand out for their unparalleled efficiency but also prove to be a wise investment, paying for themselves through significant energy savings over time.

How Does Quest's M-CoRR Technology Work?

Quest's M-CoRR Technology revolutionizes dehumidification by utilizing three separate coils - pre-evaporator, evaporator, and recovery coil. This innovative approach enhances efficiency by kickstarting the cooling process, extracting water efficiently, and recycling energy. Quest's commitment to pushing technology boundaries ensures superior moisture control and energy utilization in dehumidification systems.

Highlighted features of M-CoRR

Highest Efficiency.
Lowest Energy Usage

Higher efficiency = lower electricity usage per pint of water removed. M-CoRR technology pulls more water out of the air per kilowatt hour than any other dehumidification technology. Period.

Less Heat Output

Inefficiency = Heat. It takes energy to run the fan and compressor in your dehumidifier. During dehumidification, this energy converts to heat that warms your room. The more energy your dehumidifier consumes, the more heat it expels. Quest dehumidifiers featuring M-CoRR technology are the most efficient dehumidifiers in the world, which means they put less heat in your environment.

More Capacity,
Smaller Footprint

Your space is valuable. Dehumidifiers powered by M-CoRR are more compact. This technology averages over 20% smaller than traditional LGR dehumidification technology of the same capacity.

Quest Dehumidifier 506 - Overhead Series

The Quest Dual 506 sets a new standard in the realm of high-efficiency dehumidification. With a capacity to remove 506 pints of moisture per day and an efficiency rating of 8.1 pints/kWh, it stands out as a top choice for commercial and industrial applications. The unit operates at 10 amps, showcasing its energy-efficient design. The Quest 506 features superior air filtration (MERV-13 standard) and an auto-restart function for power outages, ensuring continuous operation and maintenance of optimal conditions. Its design allows for overhead installation, providing flexibility and space efficiency in various settings. Assembled with the highest quality components, the Quest 506 is a reliable and powerful solution for maintaining ideal humidity levels in challenging environments.

FAQ Section

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 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.
Is there a warranty for this product?
Please check the warranty tab on this page for warranty information.
How long will shipping take?
Please check our shipping policy here for shipping information.
What is the return policy?
Please check our return policy here for return policy information.

Quest 506 Specifications

@ 80° F/60% RH
Water Removal 506 Pints/Day
Efficiency 8.1 Pints/kWh
Energy Factor 3.8 Liters/kWh
Current Draw 11A
@ 75° F/50% RH
Water Removal 349 Pints/Day
Efficiency 6.2 Pints/kWh
Energy Factor 2.9 Liters/kWh
Additional Specifications Quest 165
Part Number 4036600
Dehumidifier Type Refrigerant Dehumidifier
CFM 1500
Operating Temperature 56°-95° F
Supply Voltage 220–240 VAC, 1 Phase, 60 Hz
Unit Dimensions 30.1" W x 33.8" H x 44.8" L
Unit Weight 280 lb
Control Type Requires External Control
Air Filter MERV Rating MERV 13
Air Filter Dimensions 18" x 20" x 2"
Power Cord 12ga NEMA 6-20P (10')
Refrigerant Type R410A
Refrigerant Amount 4 lb 8 oz
Drain Port Connection 3/4" Threaded NPT
Warranty 5 Year

Items in the box

Quest 506 Dehumidifier Unit

Power Cord

Drain Hose

User Manual

Warranty Information

Warranty Policy

Please Click Here to view our return and warranty policy