Name: Quest 746 Overhead 746 Pint Dehumidifier - 480V
Brand: Quest
SKU: 4046320
Price: 12999.95 USD
Availability: InStock

Home Dehumidifiers Quest Quest 746 Overhead 746 Pint Dehumidifier - 480V

Quest 746 Overhead 746 Pint Dehumidifier - 480V

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SKU: 4046320

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The Quest 746 Overhead Dehumidifier - 480V is a state-of-the-art, high-capacity dehumidification system designed for the most demanding and expansive environments. This industrial-grade unit is capable of removing an incredible 746 pints of moisture per day, making it an ideal choice for very large spaces such as massive commercial grow operations, extensive industrial warehouses, or large-scale storage facilities. Operating on a 480V power supply, the Quest 746 is engineered for efficiency and power, providing maximum dehumidification with a significantly lower energy footprint compared to other models in its class.

Its overhead design is a key feature, allowing for strategic placement that maximizes space efficiency while ensuring uniform moisture control throughout the area. The Quest 746 is renowned not only for its impressive moisture removal capacity but also for its energy efficiency, which is crucial in reducing operational costs and environmental impact in settings where continuous, high-volume dehumidification is essential.

Constructed with durability and longevity in mind, the Quest 746 features robust build quality and user-friendly controls, making it a reliable and straightforward solution for maintaining optimal humidity levels in challenging and extensive environments. The Quest 746 Overhead Dehumidifier represents the pinnacle of dehumidification technology, offering unparalleled performance for those who need a powerful, efficient, and space-saving solution to manage excessive humidity in large-scale settings.

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Quest 746 480V High-Efficiency Dehumidifier

The Quest 746 480V High-Efficiency Dehumidifier delivers advanced moisture control for large commercial and industrial spaces. It removes 730 pints daily at 8.3 pints per kWh using patented M-CoRR Technology. Its 4.9-amp draw, compact profile, onboard digital controls, and Madison, Wisconsin assembly support efficient, dependable operation.

Product Overview

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Warranty Policy

Product Overview

The Quest 746 480V combines high-capacity moisture removal with industry-leading energy performance for commercial and industrial environments. Its compact, reduced-height design supports overhead or ground placement, while onboard digital controls provide precise RH settings, maintenance notifications, self-diagnostics, Dark Mode, auto restart, and optional external control connectivity. R454B refrigerant further reduces environmental impact without sacrificing dependable humidity control.

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

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Quest sets a minimum advertised price, so what you see here is the lowest any authorized dealer can publicly list. If another site shows a Quest unit for less, they are not authorized, even if they say they are, and that puts your warranty at risk. Quest can refuse service and support on an unauthorized purchase.

The good news: as an authorized Quest dealer, we'll beat any legitimate price, we just can't post it publicly. Call, text, or email and we'll get you the best price available, plus same-day commercial and bulk quotes.

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QUEST'S PATENTED TECHNOLOGY | M-CoRR™

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 the Quest 746

High Efficiency,
Lower Energy Demand

At 8.3 pints per kilowatt-hour, the Quest 746 delivers industry-leading moisture removal while reducing electricity use, operating costs, and unwanted heat across demanding large-scale facilities and operations.

Lowest Amp Draw

Drawing only 4.9 amps at 480 volts, this efficient three-phase unit reduces electrical demand and heat output while preserving valuable panel capacity for lighting, HVAC, controls, and other essential facility equipment. Lower amperage also supports high-capacity moisture management without placing the same electrical burden associated with less efficient commercial dehumidification systems during continuous daily operation year round.

Compact, Flexible
Installation Design

Reduced height, integrated handles, and built-in hanging points support convenient overhead or ground placement in mechanical rooms, controlled environments, and other space-limited commercial and industrial facilities.

Quest 746 480V - High Capacity Series

The Quest 746 480V is a high-capacity dehumidifier engineered for demanding facilities. It removes 730 pints of moisture per day at 80°F and 60% RH with an industry-leading efficiency of 8.3 pints per kWh while drawing 4.9 amps. Its reduced-height design supports overhead or freestanding installation in space-limited facilities. Onboard digital controls provide RH settings, filter and defrost notifications, self-diagnostics, Dark Mode, auto restart, and optional external control connectivity. MERV 13 filtration improves air quality, while responsible R454B refrigerant reduces global warming potential. Assembled in Madison, Wisconsin, this unit delivers humidity management with reduced electrical demand and costs.

Installation Options For 746

Freestanding

For freestanding installations, elevate the unit to allow space for the drain trap.

Ceiling-Mounted

Dehumidifier can be mounted overhead with use of 3/8″ threaded rod.

P-Trap Requirements

Follow the diagram above for proper drain trap setup.

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Important Notice

Found a Quest unit cheaper somewhere else? Read this first.

🔍 Want the best legitimate Quest price?
Contact us directly. As an authorized Quest retailer, we may be able to offer better pricing by phone, text, or email — especially for bulk orders.

📧 info@greenthumbdepot.com 📞 (833) 416-0375

Customer Reviews

Trusted by authentic customer reviews from verified buyers worldwide.

If I could rate 6 stars I would!
If I could rate 6 stars I would! My representative Edouard B. has been shockingly responsive! Like - oh my god - an actual SERVICE oriented company. He's dug into my odd connectivity issues I've been having - and following up in an AMAZINGLY timey manner. No shit. You'll be impressed! (And the price was also unbeatable, quick shipping...it's all PERFECT). Thank you Ed!!

Customer service was outstanding great…
Customer service was outstanding great people to deal with they understand your needs and they will do their best to fulfill them there is no way I can complain about them because they are the best help out there.Thanks green thumb depot. I’ll definitely order from them again

The machine is doing just what my…
The machine is doing just what my salesman told it would do (I appreciate you Ed thank you) . The machine is what we need for our new business we’re starting up, soon to be llc and licensed. We are getting a lot of clients wanting our services. Ed I will be needing more of your products, thank you again.

Fantastic
Great prices, fantastic customer service, and mind blowing shipping! Incredible. Will be using again and telling anyone in need.

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FAQ Section

How much moisture can the Quest 746 480V remove daily?

At 80°F and 60% relative humidity, the Quest 746 480V removes 730 pints of moisture per day while delivering 8.3 pints per kilowatt-hour and drawing 4.9 amps. At 75°F and 50% relative humidity, its rated capacity is 480 pints per day, with 6.1 pints per kilowatt-hour efficiency and a 4.6-amp current draw under the published test conditions.

How is the Quest 746 powered?

The Quest 746 480V requires a 480-volt, three-phase electrical supply and is designed for hardwired installation rather than a standard power cord. At 80°F and 60% relative humidity, it draws 4.9 amps and uses 3,665 watts. At 75°F and 50% relative humidity, current draw is rated at 4.6 amps.
Its low amperage helps preserve electrical panel capacity for lighting, HVAC, controls, and other equipment while reducing the heat associated with less efficient dehumidification. The unit also includes onboard digital controls for direct humidity management and a low-voltage terminal block for an optional external control connection.
After a power interruption, the auto-restart feature returns the dehumidifier to its prior settings. Integrated controls also provide adjustable relative-humidity setpoints in one-percent increments, filter-change and defrost notifications, self-diagnostics for faster service, and Dark Mode for light-sensitive environments.
These electrical and control features support reliable operation in commercial, industrial, mechanical-room, overhead, and other large controlled-environment installations. The combination of higher supply voltage, patented M-CoRR energy recovery, and efficient moisture removal allows the system to deliver high capacity without requiring excessive amperage from the facility.

How can it be installed?

The Quest 746 480V can operate as a freestanding ground unit or be mounted overhead using 3/8-inch threaded rod. Its reduced height, integrated handles, and hanging points simplify placement in mechanical rooms, controlled environments, and space-limited facilities.

What onboard digital control features does the Quest 746 provide users?

Its integrated control panel provides adjustable relative-humidity setpoints in one-percent increments, filter-change and defrost notifications, self-diagnostics for faster troubleshooting, and Dark Mode for sensitive environments. The unit also supports auto restart after power interruptions and includes a low-voltage terminal block for connecting an optional external control system.

Which refrigerant does it use?

The second-generation Quest 746 uses R454B refrigerant, which provides a 78% lower global warming potential than the previous refrigerant option.

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 746 480V Specifications

@ 80° F/60% RH
Water Removal	730 Pints/Day
Efficiency	8.3 Pints/kWh
Energy Factor	3.9 Liters/kWh
Current Draw	4.9 Amps
Power	3,665 Watts
BTU (Total)	45,700
BTU (Heat of Condensation)	33,200
BTU (Motor Load)	12,500

@ 75° F/50% RH
Water Removal	480 Pints/Day
Efficiency	6.1 Pints/kWh
Energy Factor	2.9 Liters/kWh
Current Draw	4.6 Amps

Additional Specifications Quest 746 480V
California Title 24	Compliant
Ducted Energy Factor	7.7 Pints/kWh @ 73° F/60% RH
Part Number	4046320
Dehumidifier Type	Refrigerant Dehumidifier
CFM	1,650
Operating Temperature	56° F Min–95° F Max
Supply Voltage	480V – 3 Phase
Unit Dimensions	44.8" L x 28.9" W x 27.4" H
Unit Weight	300 lb
Control Type	Onboard Digital Control with Optional External Control Connection
Air Filter MERV Rating	MERV 13
Air Filter Dimensions	18" x 20" x 2"
Power Cord	Hardwire Only
Refrigerant Type	R454B
Refrigerant Amount	6 lb 8 oz
Drain Port Connection	3/4" Threaded NPT
Warranty	5 Year Limited

Items in the box

Quest 746 480V Dehumidifier

Hardwire Power Input

3/4-Inch NPT Drain Port

Onboard Digital Controls

UL Rated and ETL Listed

Warranty Policy

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Quest 746 Overhead 746 Pint Dehumidifier - 480V