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Image of the The Quest 746 480V featuring high capacity, 730 pints/day, 8.3 pints/kWh efficiency, multi-coil tech, digital controls, low amp draw, and compact design.

Quest 746 480V High-Capacity Dehumidifier - 746 Pints/Day

by Quest
Save $1,500.00 Save $1,500.00
$12,999.95
$12,999.95 - $12,999.95
$12,999.95
$11,499.95
$11,499.95 - $11,499.95
$11,499.95

Qualifies for multi unit discounts

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Full Manufacturer’s Warranty

You buy it, we back it! Your purchase is fully covered with a manufacturer’s warranty. More details here.

Quest 746 removes 730 pints per day with M-CoRR tech and MERV 13 filtration, providing efficient, clean, and reliable humidity control for large-scale grow rooms.

Maximize energy savings and free up amperage with a high-capacity dehumidifier built for industrial grow environments.

The Quest 746 480V Grow Dehumidifier is built to handle high humidity loads in large-scale grow environments, offering industry-leading energy efficiency thanks to patented M-CoRR Technology.

This high-capacity dehumidifier removes an enormous volume of moisture while operating at higher voltage and lower amperage, meaning it frees up space on your electrical panel for other critical equipment. That’s a game-changer for industrial-scale grow rooms, greenhouses, and cultivation facilities that demand maximum efficiency without overloading power systems.

Built for ducted and non-ducted setups, and California Title 24 compliant, the Quest 746 is designed for reliability, precision, and long-term energy savings—exactly what top-tier growers need to maximize yield and optimize their environment.

Features

  • Overhead or ground placement - Built to fit what works for your space.
  • Widest operating range of temperature and relative humidity.
  • UL rated and ETL listed - The highest safety standard.
  • Integrated handles & hanging points - For easier movement and installation.
  • MERV 13 filtration - Superior filtration removes more harmful contaminants from the air, such as dust, pollen, mold, bacteria, and some viruses.
  • Auto restart - Unit automatically defaults to prior settings in the event of a power outage.
  • Industry’s lowest amp draw - More efficient units have less heat output and free up electricity for other equipment.

What's Included?

  • Quest 746 480V Dehumidifier

Download Resources

Specifications

SKU: QUE4046320

MFG #: 4046320

Capacity: 730 pints per day

Power: 3665W

Power Cord: Hard-wire only

Supply Voltage: 480V

Current Draw: 4.9 amps

Blower: 1650 CFM

BTU (Total): 45,700

BTU (Motor Load): 12,500

BTU (Heat of Condensation): 33,200

Operating Temperature: 56–95°F

Energy Factor: 3.9 L/kWh

Efficiency: 8.3 pints/kWh

Air Filter Rating: MERV 13

Filter Size: 18" x 20" x 2"

Refrigerant: R454B

Refrigerant Charge: 104 oz

Drain Port Connection: 3/4" threaded NPT

Certifications: ETL, UL, CSA

Dimensions: 28.9" x 27" x 44.8"

Storage cabinet featuring dual doors and raised corner supports

Freestanding Unit

The Quest 746 Dehumidifier must be installed indoors in a dry, flood-protected space. Place it on a stable, level surface with clearance for maintenance and ensure air intake and exhaust remain unobstructed with at least 1 foot of clearance. The unit should not be used as a bench or table and must be placed with vibration isolation to reduce operational noise.

Isometric illustration of an industrial cabinet mounted overhead using suspension rods

Overhead Dehumidifier

The unit can be mounted overhead using 3/8" threaded rods attached to structural supports but must not be placed directly on structural members without proper vibration isolation. If installed above an area where leaks could cause damage, a drain pan must be used. Never allow the unit to be positioned where it could fall into water or discharge air directly at people or over a pool.

Drain trap diagram highlighting vented section and water seal depth

P-Trap Requirements

A P-trap with a 2-inch water seal must be installed to prevent air from being pulled into the condensate drain. The drain line should have a downward slope, with an open vent 4 inches above the trap to prevent airlocks. Ensure the unit is elevated properly for correct drainage function.

Grow Light Central expert advice for indoor growing equipment

Who should use this high efficiency dehumidifier?

  • Commercial growers managing large-scale hydroponic or greenhouse environments
  • Controlled environment agriculture facilities needing precise humidity control and filtration
  • Operators optimizing power efficiency with 480V low-amp draw systems
  • Facilities seeking Title 24 compliant equipment engineered in the USA with long-term reliability

Best applications

  • Large indoor grow operations requiring 730 pints/day moisture removal for stable VPD
  • Greenhouses and vertical farms benefiting from energy recycling via M-CoRR™ Technology
  • Clean rooms and labs needing MERV 13 air purification and consistent humidity balance
  • Industrial or tech environments like data centers and storage spaces demanding 24/7 efficiency

Why Shop with Grow Light Central?

“There’s a crapload of equipment providers out there. What makes Grow Light Central so special?”

“There’s a crapload of equipment providers out there. What makes Grow Light Central so special?”

Grow Light Central is a grow equipment solution provider connecting you to 100+ brands and 60+ suppliers trusted and used in the best grow facilities across the country.

Anthony, the owner and operator, personally ensures every order is handled right. No passing you off, no runaround, just the expert service and advice you deserve.

FAQs

What is the ideal humidity level for bud growth, and how can a humidifier help?

Seedlings thrive at 60-70% RH, vegging plants prefer 40-50% RH, and flowering needs 30-40% RH. A dehumidifier helps dial in these levels, preventing mold, mildew, and bud rot while keeping your plants healthy and maximizing yield.

What size dehumidifier do I need for my grow setup?

It depends on your grow tent or room size and how much moisture you need to pull. A 30-pint unit is great for small setups, while 50+ pint models work better for larger spaces. If you're running a big operation, go for a high-capacity unit with a built-in humidistat for full control.