Quest 746 High-Capacity Dehumidifier

Quest 746 High-Capacity Dehumidifier

Quest

$10,999.00

✔️ Authorized Quest Dealer

✔️ Lowest Price Guaranteed + No Sales Tax

✔️ Quest Manufacturer's Warranty

✔️ Free Shipping 

✔️ Questions? Call us at 1-346-326-3787
Quantity

Shipping + Delivery

We offer standard free shipping every day on orders over $50 when shipping to the lower 48 states.

Free shipping is automatically applied at checkout. Orders under $50 ship for only $5.95 to most destinations within the contiguous United States.

 

Shipping to Hawaii, Alaska, and Canada may incur an additional fee, depending on the items ordered. With the exception of Canada, we do not currently ship to international locations.

 

We typically ship products within 1–2 business days from when you place your order. Every product on our site has an estimated lead time—the number of business days it takes for an item to be processed and prepared for shipment.

 

Our standard shipping method for most products is ground shipping. In most cases, you will receive your product within 5-7 business days using ground delivery.

 

 

Returns

Quest is committed to your shopping satisfaction, so we offer a 30-Day Money-Back Guarantee on our products and a no-hassle return process.

 

30-Day Money-Back Guarantee

If you are not 100% satisfied with your purchase for any reason, you have the freedom to return your product(s) to us within 30 days for a refund.

 

Please email us at support@biohackersden.com  or call us at 1-346-326-3787 to get a return authorization (RA) number.

You will receive instructions for shipping the product back to us. You are responsible for the cost of return shipping. ALL RETURNS ARE SUBJECT TO A 25% STOCKING FEE.

Send your product back to us within 2 weeks of receiving your return authorization number. The shipment must be postmarked within this timeframe.

Upon receiving the product, we will inspect it to ensure that it is in good condition for resale, approve the return(s), and process your refund.

Policy Details and Exclusions

  • All products must be returned undamaged with all original manuals, registration cards, accessories, boxes, outer cartons and packing materials. If a product is returned damaged or with missing items, we reserve the right to assess a restocking fee up to the full value of the purchase, depending on the items damaged or missing.
  • Returns will not be accepted without a return authorization (RA) number. Once a return has been authorized and return instructions provided to the customer, the items must be returned postmarked within 2 weeks.
  • Special freight truck deliveries (those items not delivered via UPS Small Package or FedEx Small Package) must be visually inspected at the time of delivery and any damage noted on the signed bill of lading or the delivery should be refused.
  • Additional shipping charges due to customer special delivery requests (next-day delivery, international delivery, etc.) are not refundable.
  • The first day of the 30-day return period is the day the customer receives item(s). If a delivery is refused or undeliverable to the address that is provided, the customer will be charged actual shipping and brokerage charges incurred on both outbound and return shipment.

Warranty

WHO IS COVERED: This warranty extends only to the original end-user of the Quest dehumidifier, and may not be assigned or transferred. 

 

FIRST YEAR WARRANTY: Therma-Stor LLC warrants that for one (1) year the Quest dehumidifier will operate free from any defects in materials and workmanship, or Therma-Stor LLC will, at its option, repair or replace the defective part(s), free of any charge. 

 

SECOND THROUGH FIFTH YEAR WARRANTY: Therma-Stor LLC further warrants that for a period of five (5) years, the condenser, evaporator and compressor of the Quest dehumidifier will operate free of any defects in material or workmanship, or Therma-Stor LLC, at its option, will repair or replace the defective part(s), provided that all labor and transportation charges for the part(s) shall be borne by the end-user. 

 

END-USER RESPONSIBILITIES: Warranty service must be performed by a Servicer authorized by Therma-Stor LLC. If the end-user is unable to locate or obtain warranty service from an authorized Servicer, he should call Therma-Stor LLC at the above number and ask for the Therma-Stor LLC Service Department, which will then arrange for covered warranty service. Warranty service will be performed during normal working hours. The end-user must present proof of purchase (lease) upon request, by use of the warranty card or other reasonable and reliable means. The end-user is responsible for normal care. This warranty does not cover any defect, malfunction, etc., resulting from misuse, abuse, lack of normal care, corrosion, freezing, tampering, modification, unauthorized or improper repair or installation, accident, acts of nature or any other cause beyond Therma-Stor LLC’s reasonable control. 

 

LIMITATIONS AND EXCLUSIONS: If any Quest dehumidifier part is repaired or replaced, the new part shall be warranted for only the remainder of the original warranty period applicable thereto (but all warranty periods will be extended by the period of time, if any, that the Quest dehumidifier is out of service while awaiting covered warranty service).

 

 

 

Quest 746 High-Capacity Dehumidifier

Description

Engineered for Performance: The Quest 746 480V Dehumidifier

The Quest 746 dehumidifier brings a new level of efficiency with its patented multi-coil technology—designed to do more while drawing less power. Thanks to its 480-volt system, it operates at just 6.5 amps, conserving electricity for your other equipment and applications.

Why Multi-Coil Matters

At the heart of the Quest 746 is its unique triple-coil design, engineered for consistent performance even at 75°F and 50% relative humidity. Here’s how it works:

  • Coil One: Pre-cools the incoming warm, humid air.
  • Coil Two: Drops the temperature below the dew point, allowing moisture to condense and be removed.
  • Coil Three: Recovers and reuses energy, boosting overall system efficiency.

This system delivers a smooth curve of energy performance and meets the latest California Title 24 standards for both ducted and overhead installations.

Efficient Power Use

This 480V unit runs efficiently with minimal amp draw, leaving room in your circuit for additional machines or devices. UL-rated and ETL-listed, the Quest 746 meets strict safety standards without compromising capability.

Smart Design for Versatile Installations

From warehouses to wellness spaces, the Quest 746 adapts to your setup:

  • Place it on the ground or mount it overhead—your space, your rules.
  • Operates across a broad range of temperatures and humidity levels.
  • Built-in MERV 13 filtration traps airborne particles including dust, pollen, mold, bacteria, and even select viruses.
  • Integrated handles and hanging points make installation straightforward.
  • A digital control panel provides intuitive monitoring with options for alarms, password protection, and real-time system stats.

 

 

 

 

 

Features

Designed for Diverse Industries

Though popular in agriculture, the Quest 746’s performance makes it ideal for a wide array of sectors: Indoor Sports & Fitness Centers, Manufacturing and Warehousing, Food & Beverage Processing, Energy and Utilities, Research Labs and Clean Rooms, Natural Product Manufacturing.

 

Additional Functional Features

External Controls: Compatible with external humidistats like the Quest DEH 3000R or Honeywell models.

Hardwired Setup: Designed for permanent installation.

Daisy-Chain Capable: Control up to three units from one point.

Gravity Drainage: Easily manage condensation using a standard ¾-inch NPT PVC drain connection.

Indoor Use Only: Built for dry environments, safely away from rain or water exposure.

 

 

Built in the USA, Trusted Everywhere

Proudly engineered and manufactured in Wisconsin, the Quest 335 is the choice for gyms, health and wellness centres, Spas, indoor agriculture, food and beverage facilities, storage centers, and more. When clean, dry air matters—you can count on Quest.

 

Built for Growth. Designed for Peace of Mind. Whether you're running a humid gymnasium-swimming pool set up, storing materials, or managing climate-sensitive processes, the Quest 335 delivers reliable moisture control—without compromising energy efficiency or simplicity. It’s time to elevate your indoor environment with a dehumidifier designed to meet your unique needs.

 

 

Specifications

Moisture Removal Capacity: 746 pints/day

Energy Efficiency: 208-240V: 3.5 L KwH

Air Filtration: MERV-13 filter included (1 filter)

Noise Level & Fan Speed: Three speed fan, 1750 CFM airflow

Drainage: Yes.

Installation Flexibility: Freestanding or ductable

Certifications: ETL & UL listed for safety

 

 

Performance & Features

Commercial/Industrial Applications

Ideal For:

Gyms & Fitness Centers

Indoor Growing & Greenhouses

Kennels & Stables

 

Performance

Pint Capacity: 746 pints

Lowest Operating Temperature: 56°F

Energy Factor: 3.5 L/kWh

Maximum CFM: 1750

Number of Fan Speeds: 3

Refrigerant Type: R-410A

Automatic Defrost: Yes

Auto-Restart: Yes

 

Controls & Connectivity

Controls: Electronic

Humidistat: Yes

Wi-Fi Capable: Yes

Bluetooth Capable: Yes

Onboard Display: Included

 

Design & Features

Internal Condensate Pump: No

Continuous Drain Capability: Yes

Drain Hose Included: No

Drain Connection: ¾" NPT PVC (Gravity Drain)

Ductable: Yes

Filter Type: MERV-13 (1 Included)

Color: White

Wheeled: No

Handles & Hanging Points: Integrated

Placement: Floor or Overhead

 

Power & Electrical

Voltage: 440–480 V

Max Amperage: 6.5 Amps

Max Wattage: 4266 W

Power Cord Length: 10 ft.

Wiring Style: Hardwired

Plug Face Type: N/A

 

Dimensions & Weight

Height: 33.8 in.

Width: 29 in.

Depth: 44.8 in.

Weight: 340 lbs.

 

Certifications

ETL and UL Certified

California Title 24 Compliant: Yes

XACTIMATE Code: N/A

California Residents: N/A

 

Warranty

Manufacturer’s Warranty:

1-Year Full Coverage

2–5 Years on Sealed Components

 

 

 

Filtration

Number of Filters: 1

Filter Type: MERV-13

Controls & Power

Control & Connectivity

Controls: Electronic

Humidistat: Yes

Number of Speeds: 3

Maximum Airflow: Maximum CFM: 1750 CFM

Refrigerant Type: R-454B

Bluetooth Capable: Yes

 

Power Requirements

Power & Electrical

Voltage: 440–480 V

Max Amperage: 6.5 Amps

Max Wattage: 4266 W

Power Cord Length: 10 ft.

Wiring Style: Hardwired

Plug Face Type: N/A

Physical Dimensions & Weight

Dimensions & Weight

Height: 33.8 in.

Width: 29 in.

Depth: 44.8 in.

Weight: 340 lbs.

Additional Upgrades and Accessories

Condensate Pump Available: This dehumidifier is designed to gravity drain collected condensate. However, if you prefer, you can attach an external condensate pump to customize a draining system that can drain condensate upward or across longer distances to a nearby drain. The Quest Condensate Pump Kit Accessory is sold separately.

 

MERV 13 Air Filtration: The system comes standard with a MERV-13 air filter, which captures harmful allergens and particles and keeps the unit running at peak efficiency. This filter needs to be replaced every three months. You can replace your Quest MERV 13 Filter, here.

 

Advanced Humidity Control: Features onboard digital controls, optional DEH3000 digital control, is a consideration for precise humidity management

 

DEH 3000 Digital Controller: The DEH 3000 is an all-digital controller that allows you to monitor and control humidity, manage fresh air ventilation, and activate air filtration for the unit from your living space. This control also allows you to run the fan continuously instead of only when the unit is in dehumidifying mode.

 

DEH3000R Digital Controller: The DEH 3000R is similar to the DEH 3000 but also features a remote sensor that can be placed up to 100 feet away from the controller. This sensor lets you control and monitor humidity conditions separately, keeping the wall-mounted controller out of sight.

 

Quest746 Duct Kit A gravity drain hose is included to remove the excess moisture it collects. You can either drain it outside or into a reservoir.

This overhead dehumidifier can be ducted when necessary; intake and exhaust duct kits may be purchased separately.

More Features & Benefits

Healthier Air Starts Here

Protect your home from mold, allergens, and musty odors. Quest helps you create a cleaner, drier, healthier living space—every day.

Made in the USA. Built to Last.

Crafted with durability in mind, Quest units are proudly manufactured in the USA using premium components that stand the test of time and climate.

Quiet, Reliable: Always Working for You

Enjoy whisper-quiet operation and continuous protection. Quest dehumidifiers are trusted for long-term reliability in demanding commercial environments.

Engineered for Superior Humidity Control

Quest dehumidifiers deliver powerful, energy-efficient performance—built to tackle excess moisture in Gyms Spa's, Health & Fitness facilities, and Swimming Pool environments with unmatched efficiency.

Quest Premium Design

Low-Temperature Operation
Engineered to operate efficiently in cooler environments down to 49°F, ensuring year-round performance in any season.

Designed to Fit Your Needs
Designed for versatility—install freestanding with customized ducting or hang kit available.

Built for Energy Efficiency
Energy Star efficiency, designed for performance, helping lower utility bills while delivering top-tier dehumidification.

Commercial-Grade Durability
Constructed with heavy-duty steel cabinets and high-quality internal components for long-lasting reliability in harsh conditions.

MERV-13 Air Filtration Standard
Equipped with advanced filtration to capture dust, mold spores, and allergens—promoting healthier indoor air quality.

Unmatched Moisture Removal 
Removes more pints of moisture per day than standard units, ideal for Health and Fitness Facilities, Swimming Pools Environments, etc.

Specifications

 Commercial Use

Installation Flexibility: Freestanding or ductable

Pint Capacity: 746 pints/Day.

Noise Level & Fan Speed: Three-speed fan & 1750 CFM airflow

Drainage: Drain Port Connection 3/4” Threaded NPT

Commercial/Industrial Use: Health and Fitness Facilities, Bakeries, Gyms

Energy Efficiency: 7.3 Pints /kWh 

Engineered for Performance, Designed for Efficiency
Poster

Built To Last. Built To Perform

energy efficient

Many big box dehumidifiers are not energy efficient — and those that are barely make the cut. At Quest, every dehumidifier we assemble exceeds Department of Energy requirements. From the very beginning of development, we focus on building dehumidifiers that are second to none when it comes to performance, efficiency and longevity..

Water Reclamation

Quest Climate dehumidifiers don’t just remove excess moisture from the air; they create a resource for your operation. With water reclamation capabilities, water extracted can be recycled for a variety of in-facility uses — from irrigation in indoor agriculture, cleaning, cooling systems, or even restroom facilities. This innovative feature helps reduce water consumption, leading to additional cost savings and a more sustainable operations

Unmatched Warranty

Quest offer warranties that are unmatched in the industry. No other manufacturer comes close to matching it. After all, when you build a quality product, you’re not afraid to stand behind it.

Superior Filtration

Equipped with a MERV-13 filter, Quest has the best filtration of any dehumidifier on the market. What does this mean? It means our dehumidifiers remove 98% of dust, compared to the MERV-8 filter, which only has 90% dust removal. Over a six-year period, our premium filter can remove up to 2 pounds of dust, pollen, mold spores, pet dander and bacteria from the air in your home.

multi-coil refrigeration recovery

The secret behind Quest’s unparalleled energy-efficiency is our patented multi-coil design, or as we like to call it: M-CoRR (short for Multi-Coil Refrigeration Recovery). You won’t find this technology anywhere else.

M-CoRR is engineered for maximum performance, allowing Quest to be the most energy-efficient and the best return on your investment, paying for itself in energy savings over time. M-CoRR’s innovative design performs better over a wider range of dew points, even at colder temperatures, and maintains capacity regardless of airflow fluctuations.

Our Mission at Quest

FAQs

What is the most common problem in basements and buildings?

Moisture is the most common problem in buildings and basements. Excess moisture leads to mold growth, and mold growth leads to property damage, bad indoor air quality, increased odors from off-gassing of mold spores, and damage to items stored in any commercial environment.

Why do I need to control moisture in my crawl space?

Excess moisture, introduced by way of unsealed, vented crawl spaces, contributes to wood rot, mold growth and increased pest activity, including infestation and colonization. Moisture in crawl spaces often migrates to the upper levels of the home through a “stack effect.”

Why should I buy a Quest dehumidifier?

Energy Efficient. Large capacity. Commercial leader. Designed to show moisture who’s boss. Reliability. Superior Filtration (MERV-13). These are the reason you can’t go wrong with buying a Quest dehumidifier. Oh, and an industry-leading warranty.

Where do musty odors in my building come from?

Musty odors are typically a result of high humidity levels in commercial buildings and basements. This polluted air will eventually move throughout the building, carrying musty odors and other contaminates. Specifically, musty odors  come from the off-gassing of mold spores when they feed on organic materials. Solve the moisture problem and you will solve your mold problem.

How does wood rot occur in a building?

Wood rot in floor joists and support piers occurs when the moisture content is above the fiber saturation point, which is about 27-28% wood moisture content.

What pests cause damage to commercial premises ? 

The top 8 common pests that can cause damage to commercial premises are: termites, carpenter ants, powder post beetles (aka powder beetles), carpet beetles, cigarette beetles, grain weevils, house mice, and Norway rats.

Does poor air quality affect your health?  

According to the Environmental Protection Agency, health problems associated with poor indoor air quality include eye irritation, allergies, headaches and respiratory problems such as asthma. These problems can be directly related to the presence of mold and dust mite infestation at work or at home. One of the recognized solutions to addressing these health issues is effective moisture control.

Can I have high humidity in my  building? 

High humidity can greatly affect your comfort by causing you to feel either hot and sticky or cold and clammy, while also contributing to smelly, musty odors at home or at work. Musty odors come from off-gassing of mold spores when they feed on organic materials. Solve the moisture problem and you will move your mold problem.

Are Quest dehumidifiers energy efficient?

All Santa Fe dehumidifiers exceed Department of Energy standards. When you see our logos, you know that you are purchasing a dehumidifier with superior energy efficiency that will help you save money. Our dehumidifiers are built to remove more moisture using the same amount of energy as conventional units.

What is stack effect? 

Stack effect is the movement of warm, dry air rising and escaping through the upper levels of a building and cooler, wet air finding its way into the lower levels in order for the environment to equalize.

What factors should be considered when choosing the capacity of a dehumidifier?

The number one factor to consider when choosing how many pints of water removal you will need for your space is infiltration from the ground below and the air outside – experts say about 95% of the moisture entering a building enters through air infiltration. It’s also important to make sure your basement or crawl space is sealed, as this also is factored in the total size of a space.

Why is air movement important?

Air movement breaks down boundary layers at surfaces, promotes air mixing, reduces stagnant micro-environments and helps convert heat energy to the structural components you want to protect.

What does the Quest 5-year warranty cover?

WHO IS COVERED: This warranty extends only to the original end-user of the Quest dehumidifier, and may not be assigned or transferred. 

 

FIRST YEAR WARRANTY: Therma-Stor LLC warrants that for one (1) year the Quest dehumidifier will operate free from any defects in materials and workmanship, or Therma-Stor LLC will, at its option, repair or replace the defective part(s), free of any charge. 

 

SECOND THROUGH FIFTH YEAR WARRANTY: Therma-Stor LLC further warrants that for a period of five (5) years, the condenser, evaporator and compressor of the Quest dehumidifier will operate free of any defects in material or workmanship, or Therma-Stor LLC, at its option, will repair or replace the defective part(s), provided that all labor and transportation charges for the part(s) shall be borne by the end-user. 

 

END-USER RESPONSIBILITIES: Warranty service must be performed by a Servicer authorized by Therma-Stor LLC. If the end-user is unable to locate or obtain warranty service from an authorized Servicer, he should call Therma-Stor LLC at the above number and ask for the Therma-Stor LLC Service Department, which will then arrange for covered warranty service. Warranty service will be performed during normal working hours. The end-user must present proof of purchase (lease) upon request, by use of the warranty card or other reasonable and reliable means. The end-user is responsible for normal care. This warranty does not cover any defect, malfunction, etc., resulting from misuse, abuse, lack of normal care, corrosion, freezing, tampering, modification, unauthorized or improper repair or installation, accident, acts of nature or any other cause beyond Therma-Stor LLC’s reasonable control. 

 

LIMITATIONS AND EXCLUSIONS: If any Quest dehumidifier part is repaired or replaced, the new part shall be warranted for only the remainder of the original warranty period applicable thereto (but all warranty periods will be extended by the period of time, if any, that the Quest dehumidifier is out of service while awaiting covered warranty service).

Why ventilate?

The purpose of ventilating a home or building is to maintain a healthy and safe environment.

The reason for the buildup of indoor pollution in today’s buildings' and homes is a direct result of our efforts to conserve energy and save money. As the techniques and materials used to insulate and seal has improved, the result is stale and polluted air trapped inside.

Common sources of indoor airborne contaminants include:

  • Chemicals used in the construction or renovation of buildings
  • Appliances that burn gas
  • Wood-burning stoves and fireplaces
  • Pets
  • Off-gassing of furniture, cabinets, flooring, and countertops
  • Infiltration of ozone, pollen, and molds from the outside
  • People
  • Cleaning supplies
  • Humid working environments