Skip to content
Quest 225 Overhead Dehumidifier - Green Thumb Depot
Quest 225 Overhead 225 Pint Dehumidifier

Quest 225 Overhead 225 Pint Dehumidifier

See more by Quest
SKU: 4046100

Official Distributor

Found a Quest unit cheaper somewhere else?
Read this first.
$3,799.95
Preview Icon

An Important Note on Pricing and Returns:

We believe in upfront pricing and fair policies—no hidden fees, no surprises, and easy, transparent returns. If you're comparing options, we encourage you to review competitors’ fine print carefully.

We've helped countless customers who had issues elsewhere, and we’re here to make sure that never happens to you.

Or

Monthly payments start at:

$105.55/mo

Learn More

Check Icon

Monthly Payment Start at:

$105.55/mo

Learn More

Contact us about commercial pricing
Volt

Notify me when back in stock

Free Shipping

On most orders

Call Us

(833) 416-0375

Mon-Fri 9am-6pm CST

Best price, guaranteed

Contact us to unlock it

No Sales Tax

Absolutely no tax on any purchase

Easy Returns

Always hassle free

Free Shipping

Lowest Price Gurantee

No Sales Tax

Easy Returns

The Quest 225 Overhead Dehumidifier is a high-efficiency solution designed for large-scale humidity control in demanding environments. This powerful unit is capable of extracting up to 225 pints of moisture per day, making it an excellent choice for extensive indoor areas such as large grow operations, commercial storage facilities, or industrial spaces. Engineered to operate effectively in overhead installations, the Quest 225 maximizes space utilization while delivering consistent and robust dehumidification performance. Its design focuses on energy efficiency, ensuring significant moisture removal with minimal energy consumption, which is beneficial for both the environment and operational costs. The dehumidifier is built with durability in mind, featuring robust construction and user-friendly controls, making it a reliable and straightforward solution for maintaining optimal humidity levels. The Quest 225 Overhead Dehumidifier is ideal for those who require a powerful, efficient, and space-saving dehumidification system to protect their investments from the adverse effects of excessive moisture.
⚠️
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
img

Quest 225 Pint Overhead Dehumidifier

Transform your indoor growing with the Quest 225 Overhead Dehumidifier—an epitome of energy efficiency and performance. Removing up to 225 pints daily, it ensures optimal humidity control. Featuring M-CoRR Technology, compact design, digital controls, and integrated lift and hang points for easy installation. Effectively combatting issues like powdery mildew and botrytis, it safeguards crops and boosts yields. Quest's dehumidifiers offer flexibility in sizing, placement, and airflow control for the perfect indoor cultivation environment.

Product Overview

Videos

Specifications

What's Included?

Warranty Policy

Product Overview

Invest in success with Quest Dehumidifier for energy-efficient indoor grow operations. Its innovative design minimizes HVAC heat load, ensuring rapid ROI. Combat threats like powdery mildew and bud rot with Quest's proper sizing, placement, and airflow control options. Whether in a greenhouse or hydroponic system, Quest provides flexible and customizable solutions for optimal conditions and crop protection.

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

⚠️
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

Higher efficiency = lower electricity usage per pint of water removed. M-CoRR technology pulls more water out of the air per kilowatt hour than any other dehumidification technology. Period.

Less Heat Output

Inefficiency = Heat. It takes energy to run the fan and compressor in your dehumidifier. During dehumidification, this energy converts to heat that warms your room. The more energy your dehumidifier consumes, the more heat it expels. Quest dehumidifiers featuring M-CoRR technology are the most efficient dehumidifiers in the world, which means they put less heat in your environment.

More Capacity,
Smaller Footprint

Your space is valuable. Dehumidifiers powered by M-CoRR are more compact. This technology averages over 20% smaller than traditional LGR dehumidification technology of the same capacity.

Quest Dehumidifier 225 - Overhead Series

The Quest Dual 225 stands out as a top-tier 230V dehumidifier, renowned for its high capacity and efficiency. It is capable of removing an impressive 225 pints of water per day (AHAM) while maintaining an efficiency of 6.1 pints per kilowatt hour. This unit is not only energy-efficient but also features an onboard dehumidistat for automated humidity control. Its versatility allows for overhead installation or ductwork integration, catering to various commercial settings such as warehouses, gyms, and indoor grow houses. Assembled in Madison, Wisconsin, the Quest Dual 225 exemplifies the brand's dedication to quality, using premium components for unmatched durability and reliability in high-capacity dehumidification.

⚠️
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
←
→


Why Thousands of Growers Choose to Work Exclusively with Greenhouse with plants

Green Thumb Depot Logo

Them Green Thumb Depot Logo

icons-no Support
icons-no Nearly impossible to reach a real person. Endless chatbot loops, auto-replies, and unreturned emails.
icons-no Real humans. We answer quickly. Always here, always helpful
icons-no Order Processing
icons-no Orders often sit for days before being acknowledged. No clear confirmation, updates, or timelines.
icons-no Orders are processed immediately. You'll receive confirmation, tracking, and real-time updates within hours.
icons-no Shipping
icons-no Slow, vague, and unoptimized. Basic carriers, minimal tracking, and delayed delivery windows.
icons-no Fast, insured, and fully trackable shipping — optimized for speed and visibility every step of the way.
icons-no Pricing
icons-no Hidden fees, bait and switch tactics, post purchase price increases.
icons-no Our relationships guarantee the lowest prices. Transparent and fair. No surprises at checkout, and no shady tactics after the sale.
icons-no Returns & Warranty
icons-no Hidden fees, bait and switch tactics, post purchase price increases.
icons-no Clear, honest, and fast. Our return policy is built to protect your investment, not dodge responsibility.
icons-no Support
icons-no Frustrating automated responses
icons-no Fast, helpful and always supportive
icons-no Order Processing
icons-no Delays and lack of communication
icons-no Instant processing and updates
icons-no Shipping
icons-no Slow, unreliable and delayed service
icons-no Fast, insured, trackable shipping
icons-no Pricing
icons-no Deceptive pricing practices
icons-no Lowest prices, no surprises
icons-no Return & Warranty
icons-no Frustrating, misleading return policies
icons-no Clear, honest return policy

FAQ Section

How do I size a dehumidifier for a grow room?
Plants transpire about 97% of the water they receive, so the amount of water your plants consume is approximately the amount that needs to be removed each day. For example, 30 plants each receiving ½ gallon per day is an average of 15 gallons water per day. Every gallon of water is 8 pints. This example works out to 120 pints per day.
Isn’t my air conditioner a dehumidifier?
Yes, but there are issues with this solution.
1. Air conditioners remove water only when they are running. In most cases when the grow lights are off, the air conditioner is off as well. Lights-off time is when humidity is most problematic.
2. Using an air conditioner to dry a room will overcool the room, potentially causing plant stress. This will also use a significantly greater amount of energy than a Quest commercial dehumidifier.
3. The more energy efficient the air conditioner, the less moisture it actually removes. An efficient air conditioner is a terrible dehumidifier.
4. The re-heat method. Some air conditioners offer an optional heating coil as a dehumidification option. Essentially, by adding artificial heat to the room, the air conditioner is forced to operate when the lights are off and thus the air conditioner removes water. While this method works, and can be used in a pinch, it’s a poor long term solution and will use 4-8x the energy as a Quest dehumidifier. 4-8x the energy use is roughly equal to $5,000-$25,000 per year in unnecessary energy consumption.
What is the ideal humidity?
Because every plant is different, it is hard to pick just one number. However, most research indicates that 45-55% RH is the safe zone where plants are healthy, spore germination is unlikely, and pests find the environment unappealing.
How much money does a Quest dehumidifier save me in electricity?
Quest is the leader in energy efficiency and one of our models is the most energy efficient dehumidifier ever built. Depending on the model, Quest dehumidifiers can save commercial growers $100-$200 a month in electricity per unit. That’s $1,200-$2,500 per dehumidifier per year.
Can the water be reused?
Yes, Quest dehumidifiers produce neutral pH, very low TDS water. This water is safe for all plants, even consumable ones.
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 225 Specifications

@ 80° F/60% RH
Water Removal 225 Pints/Day
Efficiency 6.1 Pints/kWh
Energy Factor 2.9 Liters/kWh
Current Draw 6.9 Amps
@ 75° F/50% RH
Water Removal 143 Pints/Day
Efficiency 4.4 Pints/kWh
Energy Factor 2.1 Liters/kWh
Current Draw 6.3 Amps
Additional Specifications Quest 165
Part Number 4035400
Dehumidifier Type Refrigerant Dehumidifier
CFM 526
Operating Temperature 56°-95° F
Supply Voltage 220–240 VAC, 1 Phase, 60 Hz
Unit Dimensions 20.25" W x 21.75" H x 38" L
Unit Weight 160 lb
Control Type Onboard w/ low voltage terminal block
Air Filter MERV Rating MERV 11
Air Filter Dimensions 16" x 20" x 2"
Power Cord 14ga NEMA 5-20P (10')
Refrigerant Type R410A
Refrigerant Amount 2 lb
Drain Port Connection 3/4" Threaded NPT
Warranty 5 Year

Items in the box

Quest 225 Dehumidifier Unit

Power Cord

Drain Hose

User Manual

Warranty Information

Warranty Policy

Please Click Here to view our return and warranty policy

>