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Quest 335 Overhead Dehumidifer - Green Thumb Depot
Quest 335 Overhead 345 Pint Dehumidifier

Quest 335 Overhead 345 Pint Dehumidifier

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SKU: 4046200

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The Quest 335 Overhead Dehumidifier is a powerhouse in moisture control, specifically engineered for high-demand environments. This robust unit boasts an impressive capacity to remove up to 335 pints of moisture per day, making it an ideal choice for large-scale applications such as expansive commercial grow rooms, industrial warehouses, or big storage facilities. Designed for overhead installation, the Quest 335 optimizes space usage while providing efficient and uniform dehumidification across large areas. Its high-efficiency operation not only ensures effective moisture removal but also contributes to reduced energy consumption, leading to lower operating costs and environmental impact. The dehumidifier is constructed with durability and ease of use in mind, featuring a sturdy build and user-friendly controls. The Quest 335 Overhead Dehumidifier is a perfect solution for those needing a reliable, powerful, and energy-efficient system to maintain optimal humidity levels in challenging and extensive environments.
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Quest 335 Overhead 345 Pint Dehumidifier

Control demanding commercial moisture loads with the Quest 335 Overhead 345 Pint Dehumidifier, available for 208V, 230V, and 277V electrical systems. It removes 345 pints daily at 80° F and 60% RH while delivering 8.2 pints/kWh efficiency. Patented M-CoRR technology recycles excess heat to reduce energy demand and HVAC load. Digital onboard controls, external-control compatibility, MERV 13 filtration, auto restart, integrated handles, flexible overhead or ground placement, and lower-GWP R454B refrigerant support reliable operation across agriculture, water treatment, industrial, and commercial facilities.

Product Overview

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Specifications

What's Included?

Warranty Policy

Product Overview

The Quest 335 is engineered for commercial spaces facing heavy moisture loads, including indoor agriculture, water treatment, manufacturing, storage, and recreation facilities. Its 345-pint capacity, patented multi-coil refrigeration system, and low amp draw support efficient humidity control with reduced heat output. Digital onboard controls, external-control capability, plug-and-play power, auto restart, MERV 13 filtration, and overhead or ground placement provide flexible operation across demanding spaces.

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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Important Notice

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

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.

🔍 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

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 M-CoRR

Highest Efficiency.
Lowest Energy Usage

Rated at 8.2 pints per kilowatt-hour, the Quest 335 removes 345 pints daily while limiting electricity demand. M-CoRR technology recycles excess heat to deliver efficient moisture removal and lower operating costs across demanding commercial applications.

Less Heat Output

M-CoRR's multi-coil refrigeration design recycles excess heat created during dehumidification instead of releasing unnecessary BTUs into the room. Lower heat output reduces the burden on air-conditioning equipment, while the efficient electrical design leaves more available power for lighting, production systems, and other essential facility equipment.

More Capacity,
Smaller Footprint

The Quest 335 combines 345-pint daily capacity with flexible ground or overhead placement. Integrated handles support easier movement, while overhead mounting with 3/8-inch threaded rod helps preserve valuable floor space in crowded commercial facilities.

Quest 335 - High-Efficiency Overhead Series

The Quest 335 is a high-efficiency commercial dehumidifier available for 208V, 230V, and 277V electrical systems. It removes 345 pints of moisture daily at 80° F and 60% RH with 8.2 pints/kWh efficiency. Patented M-CoRR technology recycles excess heat, helping reduce room heat output and electrical demand. The unit supports freestanding or overhead installation, digital onboard humidity control, optional external controls, auto restart, integrated handles, and MERV 13 filtration. R454B refrigerant provides a 78% lower global warming potential, while its Madison, Wisconsin assembly supports dependable commercial operation.

Installation Options For Quest 335

Freestanding unit

Ceiling-Mounted

Can be mounted overhead with use of 3/8″ Threaded Rod

P-Trap Requirements

Follow the diagram above for proper drain trap setup.

⚠️
Important Notice

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

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.

🔍 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!!
Jim D
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
Glenn Appleton
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.
Freddie
Fantastic
Great prices, fantastic customer service, and mind blowing shipping! Incredible. Will be using again and telling anyone in need.
Kar
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FAQ Section

How much moisture does the Quest 335 remove daily?
At 80° F and 60% relative humidity, every Quest 335 voltage variant removes up to 345 pints of moisture per day. At 75° F and 50% relative humidity, the rated capacity is 221 pints per day.
Which voltage options are available for the Quest 335?
The Quest 335 is offered as model 4046200 for 208V or 230V single-phase systems and model 4046210 for 277V single-phase systems. Current draw is 8.4 amps at 208V, 7.6 amps at 230V, and 6.3 amps at 277V.
The 208/230V model uses a six-foot NEMA 6-15P power cord, while the 277V model uses a six-foot NEMA L7-15P connection. Confirm the available voltage, receptacle, circuit ampacity, and local electrical requirements before installation.
Can the Quest 335 be installed overhead or on the ground?
Yes. The Quest 335 supports freestanding ground placement or overhead mounting using 3/8-inch threaded rod. Integrated handles assist with movement, while the overhead option helps preserve usable floor space in commercial and industrial facilities.
What control options does the Quest 335 provide?
The unit includes onboard digital humidity controls and a low-voltage terminal block for an optional external control. Auto restart restores the previous operating settings after a power outage, supporting consistent humidity management without requiring manual reconfiguration.
How do filtration and refrigerant improve operation?
MERV 13 filtration captures harmful airborne contaminants, including dust, pollen, mold, bacteria, and some virus carriers. The Quest 335 also uses R454B refrigerant, which has a 78% lower global warming potential than the previous refrigerant platform.
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 335 Specifications

@ 80° F/60% RH
Water Removal 345 Pints/Day
Efficiency 8.2 Pints/kWh
Energy Factor 3.8 Liters/kWh
Current Draw 8.4A @208V / 7.6A @230V / 6.3A @277V
Power 1,700 Watts
BTU (Total) 21,500
BTU (Heat of Condensation) 15,700
BTU (Motor Load) 5,800
@ 75° F/50% RH
Water Removal 221 Pints/Day
Efficiency 6 Pints/kWh
Energy Factor 2.8 Liters/kWh
Current Draw 6.3A @277V / Not Listed for 208–230V
Additional Specifications Quest 335
Part Number 4046200 – 208/230V / 4046210 – 277V
Dehumidifier Type Refrigerant Dehumidifier
CFM 900
Operating Temperature 56°–95° F
Supply Voltage 208V / 230V / 277V, 1 Phase, 60 Hz
Unit Dimensions 32.9" L x 24.6" W x 23.7" H
Unit Weight 215 lb
Control Type Onboard Digital Controls with Low Voltage Terminal Block
Air Filter MERV Rating MERV 13
Air Filter Dimensions 20" x 22" x 2"
208/230V Power Cord 14ga NEMA 6-15P (6')
277V Power Cord NEMA L7-15P (6')
Refrigerant Type R454B
Refrigerant Amount 3 lb 8 oz
Drain Port Connection 3/4" Threaded NPT
Fans Variable Speed EC Motor
Non-Ducted Energy Factor 6.2 Pints/kWh @ 65° F/60% RH
Ducted Energy Factor 7.4 Pints/kWh @ 73° F/60% RH
Warranty 5 Year

Items in the box

Quest 335 Dehumidifier Unit

Voltage-Specific Power Cord

3/4" NPT Drain Port

Onboard Digital Controls

MERV 13 Air Filtration

Warranty Policy

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