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QUEST DEHUMIDIFICATION

Looking for the Best Deal on Quest Dehumidifiers?

Extreme volume pricing through optimized distributor networks. Get your system sized correctly for your actual grow conditions. Free consultation with a CEA expert who has 27 years of experience.

27Yrs CEA Experience
10Years Commercial Consulting
FreeExpert Help
100% Free

Get Free Expert Help

Request commercial pricing, ask about rebates, or just sanity check your light setup.

Warning: Elliott may answer in more detail than you asked for.

Extreme volume pricing through optimized distributor networks. Get your system sized correctly for your actual grow conditions. Free consultation with a CEA expert who has 27 years of experience.

27Yrs CEA Experience
10Yrs Consulting
FreeExpert Help
Quest sizing validation against your actual canopy load
Catch equipment mismatches before you buy
Lights-off humidity failure analysis
Lowest quotes in the industry through order consolidation and direct sourcing
Product recommendations backed by the largest commercial operators in the industry
Why Quest?

The Industry Standard for Commercial Dehumidification,
Sized Right.

Quest dehumidifiers are among the most widely specified units in commercial CEA. But the unit itself is only half the equation.

Quest uses refrigerant-based technology to remove moisture through condensation, and they are effective across the warm, humid conditions typical in flowering rooms. They have earned a strong reputation in commercial cultivation for reliability, capacity, and service support.

But here is what most growers get wrong: they focus on the unit and skip the system. The sizing, the placement, and the integration with your HVAC system is what determines whether it actually protects your crop.

That is exactly what Elliott does. He takes your floor plan, your canopy load, and your climate targets, and makes sure the Quest system you buy is the right one for your actual conditions. Not undersized. Not overpaying. Right.

Overhead

Overhead / Ceiling-Mounted Units

Designed for larger rooms. Require proper airflow distribution planning to avoid dead zones and ensure even moisture removal across the entire canopy.

Portable

Portable / Floor Units

Flexible placement for drying rooms or supplemental capacity. Not a substitute for properly sized overhead systems in commercial flower rooms.

Ducted

Ducted Systems

Integrated with HVAC ductwork for tighter environmental control. More complex installation, but can solve distribution challenges in large or irregular spaces.

Planning Framework

Dehumidification Planning Is a
Step-Wise Process.

You cannot size a dehumidifier correctly without understanding the full system around it. Elliott walks every client through these four steps before recommending a single unit.

Plan for Your Entire Grow

Map out your full operation before sizing any single system. Veg, flower, drying, mothers, clones. Each phase has different climate needs.

Determine Your Irrigation

Your irrigation strategy drives your moisture load. Every gallon of water you put into the room eventually ends up in the air. Start here.

Calculate Your Dehu Requirements

Based on canopy size, irrigation volume, and growth phase targets. Size for peak demand, then add buffer. No one ever wished they had less capacity.

Calculate Your Cooling Needs

Dehumidification adds heat. Your cooling system must account for it. This is why you calculate dehu first, then AC requirements.

10Years Commercial Consulting
27Yrs CEA Experience
FreeExpert Help
The Problem

Proper Dehumidification Isn't an Option.
It's Mandatory.

The biggest single point of failure in a CEA operation is improper or undersized dehumidification. And it doesn't manifest itself until it's too late, like week 6 in flower. Once you have a problem, it can be extremely difficult to solve. Proper planning can avoid all of the hassle and expense.

Powdery Mildew (PM)

The single biggest fungal threat in indoor cultivation. Spreads through airborne spores that enter grow rooms via infected clones, contaminated equipment, or poor environmental control. High humidity and stagnant air are the primary accelerants. Once present, it can spread facility-wide within days.

Airborne spores spread facility-wide within days

Bud Rot (Botrytis cinerea)

A fungal disease that attacks flowers from the inside out, spreading quickly in cool, humid conditions with poor airflow. By the time you can see it, the damage is done. Prevention through proper humidity control is the only reliable strategy.

RH >85% = active Botrytis risk
Common Failures

The Mistakes That Cost Growers the
Most Money

Most dehumidification plans blow up before a single unit ships, because capacity was calculated wrong, or never calculated at all.

01

Shop by performance, not nameplate.

Quest units are rated at specific test conditions (80°F, 60% RH). Real-world performance in your grow room will differ. If you size based on the number in the model name, you are almost certainly undersized.

02

Forgot 2x conversion, bought half of what's needed.

Liters-to-pints conversion errors are shockingly common and result in half the dehumidification capacity you actually need. Double-check every unit conversion before placing an order.

03

Sizing for average load only, instead of peak load.

Your dehumidification needs spike at lights-off when temperatures drop and RH climbs. Size for the peak, not the average, or you will lose the crop at the worst possible moment.

04

Assuming AC will provide all of your dehumidification needs.

That is why you have to calculate dehumidification needs first, then AC requirements. Air conditioning removes some moisture, but nowhere near enough for a flowering canopy.

05

Controlling RH instead of actual VPD.

Relative humidity is only half the picture. Vapor Pressure Deficit (VPD) accounts for both temperature and humidity, and it is what your plants actually respond to. Chasing RH alone leads to incorrect environmental targets.

06

AC stops at lights-out, temperatures drop, and RH spikes.

This creates peak dehumidification demand at the exact moment your cooling system stops running. Without properly sized dedicated dehumidification, this is where crops are lost.

07

Matching ratings to peak conditions and moisture.

All dehumidifiers have drastically lower efficiencies at lower temperatures and lower humidity, creating more caveats for proper sizing. A unit rated at 300 pints at 80°F/60% RH performs very differently at 68°F/55% RH.

Smaller, less expensive dehumidifiers barely work, and never perform according to specs. Avoid these at all costs and go for the commercial units.

One free call with Elliott prevents all seven of these.

Before you size a single unit, before you sign a single PO, get the math right. Elliott has sized Quest systems for facilities from 1,000 to 50,000+ square feet.

Get Free Expert Help →

Same-day response most days. No obligation.

Talk to a CEA Professional with 27 Years of Experience

Elliott Gorfain isn't a sales rep. He's a working CEA expert with a B.S. in Molecular Biology, 27 years of hands-on growing experience, and a decade of commercial consulting. He has worked at Hydrofarm, Greencoast, Hanna Instruments, and Impello.
Bring your floor plan, current equipment list, or any quotes you've received. He'll tell you what makes sense and what doesn't. No pitch. No obligation.

27 yearsControlled Environment Agriculture
10 yearsCommercial CEA consulting
B.S. Molecular BiologyScientific + lab background
Free30-Min Expert Call
Former roles at
Hydrofarm GreenCoast Hanna Impello
Featured Brand
Quest
The Full Lineup

The Quest Dehumidifier Lineup: Specs, Sizing & Today's Best Price

Every Quest unit below is built by Therma-Stor in the USA and sized for sealed grow rooms and greenhouses. Tell us your room and we'll quote the right model at the best price we can put in writing.

Quest Hi-E Dry 140 portable dehumidifier

Quest Hi-E Dry 140

Commercial-grade portable for grow rooms and processing spaces, with wheels and an internal pump.

  • CapacityUp to 135 pints/day
  • Efficiency7.2 pints/kWh
  • Amp draw6.8A
  • Operating range56–95°F
Get today's best price on the Quest Hi-E Dry 140 →

Manufacturer minimum advertised pricing means we can't print our real numbers here. Request a quote and we'll send today's best price on any Quest model, with volume and bundle discounts applied.

What Growers Say

What Commercial Growers Say About This Call

Real results from professional cultivators who rely on Quest to dial in precise humidity control across every stage of growth.

System Sizing Review
✓ Prevented major undersizing mistake
Elliott caught a conversion error in our sizing calculations that would have left us with half the dehumidification we needed. That one call saved us from a full crop loss.
Commercial Grower Indoor Facility
Quote Validation
✓ Identified undersized systems before install
We had quotes from three contractors. Elliott reviewed all of them and showed us where two were undersized for our lights-off conditions. Nobody else even mentioned it.
Operations Lead Multi-Room Facility
Load Balancing
✓ Optimized room-by-room capacity
Straight shooter. Told us we were oversized on one room and undersized on another. Saved us money and protected the crop at the same time.
Owner/Operator Commercial Cultivation
How It Works

Three Steps. Zero Friction.

No scheduling tools, no waiting weeks. You fill out the form, Elliott calls you.

Tell Us About Your Grow

Tell us your setup, your space, and what you are trying to solve. Takes 60 seconds.

Elliott Calls You

Usually same day, often within the hour. He calls you directly. Yes, actually him.

You Get Clarity + a Plan

Sizing notes, system recommendations, and prioritized next steps. A plan you can take straight to your contractor or use to evaluate quotes.

Common Questions

Questions We Hear Every Week

Even if Quest is the right brand, the model, quantity, and placement still need to be dialed in for your specific room conditions. Elliott has sized Quest systems for facilities from 1,000 to 50,000+ square feet. He'll make sure you're not oversized, undersized, or overpaying.
It comes down to pints per day versus your room's transpiration load. As a rough rule: total daily gallons fed to plants ≈ pints the dehu must remove. The Quest 506 through 876 cover most commercial rooms; the 70–225 fit smaller sealed rooms. Send us your room size and light count and Elliott will size it exactly, free.
Yes. We're an authorized dealer/distributor of Quest (Therma-Stor) dehumidifiers, with volume and multi-unit pricing available. Every unit ships new with full manufacturer warranty.
Not for a commercial operation. Portable dehumidifiers can be used in a pinch when equipment fails or is being serviced, but should never be relied upon for daily duty. Mini-splits can be effective, but are generally less efficient than larger split systems. Smaller equipment typically uses lower voltage, which requires more amps, is less efficient, and generates more heat. Upgrade to higher voltages where possible, especially equipment with compressors.
It can, if you chase low RH instead of targeting the right VPD for your growth stage. Very high VPD causes stress, reduces nutrient transport, and can damage the plants. "Drier is safer" is not a universal rule. The goal is the right range, held tightly, without fast swings.
A dehumidifier's efficiency and capacity both decrease with cooler temperatures and lower RH. Dehumidifiers are typically rated at 80 degrees Fahrenheit and 60% RH, and this number is reflected in the model name. However, grow conditions fluctuate throughout the day, and targets fluctuate depending upon the phase of growth. Always size your dehu for peak demand and then add more for a buffer. No one ever said that they wish they had less dehu capacity.
Almost always. Our direct relationships with Quest mean pricing most growers cannot access. That discount comes straight to you, with volume and bundled savings on top.
Yes, it's free. The catch is that we also sell the equipment, and we'd love to earn your business. But the call itself is genuinely useful whether you buy from us or not. The hard part is getting him to stop.
Is This For You?

Who This Call Is and Isn't For

This is for you if...

  • You're building, planning, or optimizing a commercial grow

  • You're looking at Quest and want to make sure you're sized correctly

  • You've gotten quotes and want a second opinion from someone who isn't selling you a contract

  • You want the best price on Quest and don't know who to trust

  • You're concerned about humidity, fungus, or crop loss in flower

This is NOT for you if...

  • You're running a home grow or hobby setup

  • You're not open to hearing what actually works vs. what you expected to hear

Get Quest Sized Right.
Get the Best Price.

One free call with Elliott. Sizing validation, system recommendations, and the lowest price available. No pressure, no obligation.

  • Commercial projects only
  • No pressure, no obligation to buy
  • We won't spam you — ever
  • Same-day callback most days
  • You get the 1-page plan even if you don't buy
Call(833) 416-0375
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Warning: Elliott may answer in more detail than you asked for.

Professional growers only Not for home grows No pressure We won't spam you Same-day callback most days