Quest 335 High Efficiency Overhead Dehumidifier - 345 Pints/Day

Q: 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.

by Quest

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$5,799.95 - $5,799.95

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The Quest 335 277V offers high-efficiency dehumidification with M-CoRR Technology, MERV-13 filtration, and lower amperage for energy savings, making it ideal for commercial spaces with 277V outlets.

Control humidity efficiently and free up power with a high-capacity dehumidifier built for 277V and 208/230V grow environments.

The Quest 335 Grow Dehumidifier delivers powerful moisture removal, advanced energy efficiency, and superior air filtration, all in a high-voltage, low-amperage design built for commercial grow rooms and industrial-scale cultivation facilities.

This model perfectly fits grow operations with existing 277V or 208/230V electrical infrastructure, often installed for lighting systems. With lower amperage draw, it frees up power for other critical equipment while still delivering 345 pints per day of water removal at 80°F and 60% RH. Built with Quest’s patented M-CoRR Technology, the Quest 335 recycles excess heat, reducing strain on your HVAC system and cutting operational costs.

Features

Overhead or ground placement – Built to fit what works for your space.
Plug-n-play – No installation required.
High efficiency – No dehumidifier is more efficient.
Widest operating range – Of temperature and relative humidity.
UL rated and ETL listed – The highest safety standard.
Digital control – Digital control interface with external control option.
Onboard dehumidistat – Along with a low voltage terminal block.
Integrated handles – For ease of movement.
Long power cord – For extended reach.
Auto restart – Unit automatically defaults to prior settings in the event of a power outage.
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.

What's Included?

Dehumidifier
4 x Feet
Drain Hose
Drain Adapter ¾” NPT PVC to 5/8” Hose Barb
4 x Rivnut Plugs

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Specifications

SKU: QUE4046210

Dehumidifier Type: Refrigerant Dehumidifier

Water Removal:

@ 80°F | 60% RH: 345 Pints/Day

@ 75°F | 50% RH: 221 Pints/Day

Efficiency:

@ 80°F | 60% RH: 8.0 Pints/kWh

@ 75°F | 50% RH: 6.0 Pints/kWh

Energy Factor:

@ 80°F | 60% RH: 3.8 Liters/kWh

@ 75°F | 50% RH: 2.8 Liters/kWh

Current Draw: 6.3 Amps

Power Consumption: 1,700 Watts

BTU Ratings:

Total: 21,500 BTU

Heat of Condensation: 15,700 BTU

Motor Load: 5,800 BTU

California Title 24 Compliance:

Non-Ducted Energy Factor: 6.2 Pints/kWh @ 65°F | 60% RH

Ducted Energy Factor: 7.4 Pints/kWh @ 73°F | 60% RH

CFM (Airflow): 900

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

Supply Voltage: 277V or 208/230V

Unit Dimensions: 32.9” L × 24.6” W × 23.7” H

Unit Weight: 215 lbs

Control Type: Onboard digital controls with low voltage terminal block

Air Filter:

MERV Rating: MERV 13

Dimensions: 20” × 22” × 2”

Power Cord: NEMA L7-15P (6’)

Refrigerant Type: R454B

Refrigerant Amount: 3 lbs 8 oz

Drain Port Connection: 3/4” Threaded NPT

Fans: Variable Speed EC Motor

Warranty: 5-Year Limited

Freestanding dehumidifier unit with digital display and water tank

Freestanding Installation (On the Ground)

For ground installation, the Quest 335 dehumidifier must be placed on a stable, level surface and elevated at least 6 inches above the secondary drain pan for proper drainage. Use the included plugs to cover any hanging locations on top of the unit.

Ceiling-mounted dehumidifier unit with grille and control panel

Overhead Installation

For overhead mounting, the unit can be securely installed using 3/8" threaded rods attached to structural supports. It should not be suspended from its sides or ends to prevent damage. When hanging the unit, cover base pan holes with the included plugs to maintain stability.

White PVC P-trap plumbing drain pipe under sink

P-Trap Requirements

A P-trap with a 2-inch water seal is required to prevent air from being drawn through the condensate drain. The drain line should have a downward slope, with an open vent positioned 4 inches above the trap to avoid airlocks. Ensure the unit is elevated 6 inches above the drain pan for proper clearance.

Grow Light Central expert advice for indoor growing equipment

Who Should Use This Dehumidifier?

Commercial and industrial facilities needing a 277V unit for efficient humidity control.
Grow room operators with existing 277V outlets for lighting.
Energy-conscious businesses benefiting from lower amperage usage.
Facilities prioritizing air quality with advanced MERV-13 filtration.

Best Applications

High-moisture environments requiring consistent dehumidification with M-CoRR Technology.
Grow rooms and processing facilities needing precise climate control.
Health-sensitive operations using MERV-13 filtration to capture mold, dust, and bacteria.
Scalable installations meeting California Title 24 compliance for various setups.

Why Shop with Grow Light Central?

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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.