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Free Shipping on most orders over $175 | Sales Tax in NJ only
Free Shipping on most orders over $175 | Sales Tax in NJ only
Quest 746 high-capacity dehumidifier with a large black exhaust grill featuring a hexagonal pattern, green handles on top, and the Quest logo.

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

by Quest
$11,499.95 - $11,499.95
$11,499.95
$11,499.95 - $11,499.95
$11,499.95

🌿 Free shipping on $175+ orders in the USA

🌿 Ships to Canada, AK & HI. Call us for info

🌿 Price match guarantee, details here

Energy Rebates & Bulk Pricing Available

SAVE BIG on your grow setup! Email or call us at (973) 206-7590. For rebates eligibility, click here.

Cash Payment Discounts & Financing Options

Get an additional 3% off when you pay by ACH, Money, or Zelle. Select your option at check out.

We accept all major credit cards, crypto and Paypal 0% credit plans. More details here.

Full Manufacturer’s Warranty

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

Designed for large spaces, Quest 746 480V operates with lower amperage at higher voltage, freeing up panel space.

Get to Know the Quest 746 480V High-Efficiency Dehumidifier with M-CoRR Technology - 746 Pints/Day

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, and mold, as well as 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

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.

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.

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.

Specifications

Part Number: 4037610

Dehumidifier Type: Refrigerant Dehumidifier

Water Removal:

@ 75°F | 50% RH: 530 Pints/Day

Efficiency:

@ 75°F | 50% RH: 5.0 Pints/kWh

Energy Factor:

@ 75°F | 50% RH: 2.4 Liters/kWh

Current Draw: 6.25 Amps

California Title 24 Compliance:

Non-Ducted Energy Factor: 6.3 Pints/kWh @ 65°F | 60% RH

Ducted Energy Factor: 7.1 Pints/kWh @ 73°F | 60% RH

CFM (Airflow): 1,750

Operating Temperature Range: 56°F Min – 95°F Max

Supply Voltage: 480V – 3 Phase

Unit Dimensions: 44.8” L × 28.9” W × 34.1” H

Unit Weight: 340 lbs

Control Type: Requires External Control

Air Filter:

MERV Rating: MERV 13

Dimensions: 18” × 20” × 2”

Power Cord: Hardwire Only

Refrigerant Type: R410A

Refrigerant Amount: 6 lbs 4 oz

Drain Port Connection: 3/4” Threaded NPT

Warranty: 5-Year Limited

Who Should Use This Dehumidifier?

  • Large-scale facilities managing extreme humidity loads in controlled environments
  • Commercial growers needing high-capacity dehumidification with 746 pints/day.
  • Operators using 480V power freeing up amperage for additional equipment.
  • Energy-conscious businesses benefiting from M-CoRR Technology for efficiency.

Best Applications

  • High-humidity environments requiring consistent moisture control in large spaces.
  • Industrial and agricultural setups optimizing energy use with advanced coil design.
  • Facilities with limited electrical capacity maximizing power efficiency at higher voltage.
  • California-compliant operations meeting Title 24 requirements for installation.

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 cannabis equipment solution provider connecting you to 100+ brands and 60+ suppliers trusted and used in the best cannabis facilies across the country.

With years of cannabis growing experience, 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’s the best humidity level for cannabis, and how does a dehumidifier 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.

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