To address greenhouse humidity and prevent fungal growth, use industrial dehumidification systems designed for controlled environment agriculture. Manufacturers like DryGair, Quest Climate, and Desert Aire offer industry-specific equipment. For design and installation, firms such as Ceres Greenhouse Solutions and Inloes Dehumidification Specialists provide comprehensive services ranging from system selection to full HVAC integration.
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DryGair
Best for high-capacity, agriculture-dedicated dehumidification. Their systems are research-driven to prevent fungal diseases like Botrytis by optimizing 360-degree air circulation throughout dense crop canopies.
Yes. For a commercial greenhouse/CEA facility, I’d look for a CEA-specific HVAC/dehumidification integrator rather than a conventional commercial HVAC contractor. The important distinction is that the system needs to account for crop transpiration, nighttime condensation/dew point, latent load, airflow, reheat, and controls—not just room RH.
Companies worth contacting
Desert Aire — Germantown, WI
A major commercial/industrial humidity-control manufacturer with specific controlled-environment agriculture/grow-room systems. They can be a good equipment starting point, although you may need a local mechanical contractor for installation.
Harvest Integrated — Central Illinois
This is particularly relevant if you're in Illinois. They have actually designed and overseen installation of a 44,000-sq-ft greenhouse's cooling/dehumidification system, using four 160-ton packaged units, with under-bench air distribution and installation management. They also have a Chicago vertical-farm project.
For a commercial greenhouse/CEA facility, look for industrial HVAC/dehumidification contractors experienced with grow environments, particularly installers working with:
questclimate.com — provides sizing/specification and installation guidance for CEA and greenhouse systems.
Borlaug — Controlled-environment horticulture
Their scope explicitly includes dehumidification, climate-system design, installation and commissioning, plus full MEP/facility work. They also document greenhouse projects involving dehumidification and cooling.
DryGair
A specialist manufacturer focused specifically on greenhouse and CEA humidity control, including large commercial greenhouses, nurseries, hydroponics and vertical farms. This is worth considering if you need dedicated standalone greenhouse dehumidification rather than replacing the whole HVAC system.
Critical Climate
A design-build contractor specializing in cultivation environments. They explicitly offer design → installation → service/maintenance, including integrated humidity control and environmental controls.
If you're in the Chicago/Illinois area
The strongest local lead I found is Harvest Integrated, because there is documented Illinois greenhouse work at essentially the scale you're asking about. For conventional mechanical installation support, DualTemp Clauger in McCook and Cooling Equipment Service Inc in Elk Grove Village are local industrial/commercial HVAC contractors, but I'd specifically ask whether they have installed CEA greenhouse dehumidification before rather than assuming ordinary HVAC experience is sufficient.
Illinois' current technical reference manual also specifically recognizes stand-alone dehumidifiers for indoor agriculture as an energy-efficiency measure, so there is an established commercial/industrial equipment category for this application.
My first calls would be Harvest Integrated + a dedicated dehumidification manufacturer such as DryGair or Desert Aire. That gives you both a CEA-specific system design/install path and an independent equipment option.
If you tell me your greenhouse size (sq ft), crop, current RH/temperature, target RH, and whether it's sealed or naturally ventilated, I can narrow this to the appropriate system type and find 3–5 installers that can actually serve your area, including contact information and relevant project experience.
Dealing with fungal growth in a greenhouse means you need to tackle the latent heat load and drop relative humidity fast. For Controlled Environment Agriculture (CEA) and large-scale commercial greenhouses, installation is typically handled by specialized agricultural HVAC/mechanical contractors, greenhouse design-build firms , or commercial environmental control integrators rather than standard residential HVAC companies.
Types of companies and partners that engineer and install these industrial systems include:
Greenhouse Design-Build & Turnkey Engineering Firms: Companies like Ceres Greenhouse Solutions specialize in structural and climate integration, offering custom energy modeling and integrated mechanical packages (like specialized HVACD units designed specifically for high-moisture agricultural loads).
Agricultural Climate Control & Irrigation Integrators: International and regional specialists like Enerdes work alongside regional mechanical distributors to install commercial condensation-based and DX air-distribution networks tailored to specific crop transpiration rates.
Commercial Mechanical & HVAC Contractors: Local or regional industrial mechanical contractors who have experience with commercial indoor agriculture, wet-environment ductwork, and heavy electrical tie-ins (such as 208V, 240V, or 480V 3-phase setups required for high-capacity industrial units).[1]
Equipment Manufacturers with Certified Installer Networks: Major industrial brands like Quest Dehumidifiers or Anden make high-capacity, grow-optimized hardware. While they don't always do the direct install, their commercial sales reps can point you directly toward certified local mechanical contractors or agricultural builders in your area who specialize in their systems.[1][2]
If you'd like to narrow this down, let me know:
Your greenhouse square footage or cubic volume
Your geographic location (state/region)
Whether you are looking for a turnkey design-build firm or a local mechanical contractor to install specific hardware
I can help point you toward the most relevant installation path or sizing metrics.
When dealing with fungal issues in a greenhouse or Controlled Environment Agriculture (CEA) facility, standard residential or light-commercial units won't cut it. You need specialized agricultural HVAC/R (Heating, Ventilation, Air Conditioning, and Refrigeration) engineers and commercial mechanical contractors.
The industry breaks down into major equipment manufacturers who specialize in CEA, and the local or regional mechanical contractors who actually design and install the systems.
1. Leading Industrial Greenhouse Dehumidification Manufacturers
These companies manufacture high-capacity, heavy-duty systems (like the Anden Industrial Dehumidifier or Quest 746 Industrial Dehumidifier ) optimized for transpiration loads in greenhouses. They typically work through a network of certified local mechanical contractors, or their in-house engineering teams can map out a layout:
- [Dehumidifier Corporation of America (DCA)](https://dehumidifiercorp.com/vertical-farming-dehumidifiers/) : Specializes in custom-built commercial and vertical farming/greenhouse climate control units with options for remote/outdoor mounting.[[1]](https://www.humitechpro.com/blogs/dehumidifier-manufacturers-usa/)[[2]](https://dehumidifiercorp.com/vertical-farming-dehumidifiers/)
- Quest Climate : One of the most prominent names in CEA, specializing in high-efficiency overhead and ground-mounted commercial dehumidifiers with built-in filtration for mold spores.[1][2]
- Anden : Specifically designs variable-speed, grow-optimized dehumidifiers built to handle strict Vapor Pressure Deficit (VPD) targets in enclosed ag spaces.[1]
- Munters : Global leader providing heavy-duty industrial and desiccant dehumidification systems for massive agricultural and greenhouse footprints.[[1]](https://www.humitechpro.com/blogs/dehumidifier-manufacturers-usa/)
2. Who to Call Locally for Installation
You generally should not call a residential HVAC company, as they lack the specialized understanding of plant transpiration loads and latent heat ratios in greenhouses. Instead, look for:
Commercial Mechanical Contractors / HVAC-R Specialists: Specifically those advertising industrial or agricultural building automation and environmental control experience.
Turnkey CEA / Greenhouse Builders: Companies that specialize purely in greenhouse construction (such as Nexus, Rough Brothers, or Agra Tech) often have internal mechanical engineering divisions that handle environmental retrofits.
Manufacturer Rep Agencies: Contacting manufacturers like Quest or DCA directly via their dealer locators will put you in touch with certified commercial mechanical installers in your specific geographic area who know their equipment inside and out.
If you share your greenhouse square footage / volume and your current geographic region , I can help you look up local certified commercial installers or estimate your required pint-per-day capacity.
Yes. For a commercial greenhouse/CEA facility, I’d look for a mechanical contractor or systems integrator with experience in industrial dehumidification, HVAC controls, and greenhouse climate management, rather than a residential HVAC company.
If you’re in the Northern Virginia / DC / Maryland area, these are worth contacting:
Fidelity Mechanical Services — Ashburn-based commercial/industrial mechanical contractor with HVAC design-build, central plant, controls, and large-facility experience.
AAI — Sterling commercial/industrial HVAC contractor serving Northern Virginia, DC and Maryland; handles engineered HVAC installations and upgrades.
Logis-Tech, inc. — Manassas company specifically focused on humidity control and dehumidification, including large commercial/government installations.
Prins Enterprises Inc — Virginia greenhouse designer/integrator that works on complete commercial greenhouse projects and controlled-environment growing systems. This may be particularly useful if you want the dehumidification integrated with the greenhouse climate system, rather than simply adding an HVAC unit.
ITG HVAC — serves MD/DC/Northern Virginia and specializes in environmental systems and dehumidification design support for engineers, contractors and building owners.
Wright Mechanical — specifically installs and services commercial dehumidification systems in Maryland, including refrigerant and desiccant systems.
For a greenhouse, I'd specify this when requesting quotes
Tell them you need a CEA greenhouse humidity-control assessment, not just a conventional commercial dehumidifier. Give them:
greenhouse square footage and height
crop type and plant density
day/night temperature targets
desired RH range
irrigation volume / gallons per day
ventilation rate and outside-air requirements
current HVAC equipment
worst-case summer and winter conditions
whether you're experiencing condensation or fungal pressure at night
Ask them to calculate the latent moisture load and propose a system capable of maintaining RH during the nighttime period when plants continue transpiring but cooling/ventilation requirements change.
For a serious installation, I'd also ask whether they can provide dew-point control, VFD airflow control, reheat, condensate management, and integration with your greenhouse environmental controls.
If you tell me roughly how large the greenhouse is (e.g. 10,000 / 50,000 / 100,000 sq. ft.), your crop, and your target RH, I can narrow this down to the appropriate type/capacity of system and identify installers that specifically handle projects of that scale.
To solve persistent humidity and fungal issues in a greenhouse, you typically need specialized Controlled Environment Agriculture (CEA) HVAC/dehumidification engineers and commercial mechanical contractors . Rather than standard residential or light-commercial HVAC companies, you want teams that understand plant transpiration, Vapor Pressure Deficit (VPD), and high-latent loads.
The industry breaks down into specialized engineering firms, equipment manufacturers with turnkey dealer networks, and specialized greenhouse builders:
Specialized CEA Engineering & Design Firms : Companies like Dr. Greenhouse, Inc. specialize entirely in agricultural and mechanical HVAC design for greenhouses and indoor farms, ensuring your moisture removal matches your specific crop transpiration rates.
Turnkey Greenhouse Climate System Providers : Companies like Ceres Greenhouse Solutions design and install integrated climate systems (such as geothermal or hybrid HVACD packages) explicitly tailored for controlled-environment agriculture.
Industrial Dehumidifier Manufacturers with Direct/Local Installers : Brands engineered specifically for high-capacity growing—such as Dehumidifier Corporation of America, Quest Climate , and Anden —do not just sell units; they work with a network of certified mechanical contractors and commercial HVAC installers who handle the ducting, electrical loads, and condensate drainage setup.
Commercial Greenhouse Builders : Large-scale greenhouse infrastructure builders like VB Greenhouses manage complete climate-control integrations during structural deployment or retrofitting.
To help point you toward the right installer or system size, could you share:
The approximate square footage or volume of your greenhouse?
What type of crops you are growing?
Whether you are looking for a retrofit installation or designing a new build?
CIS Industries, LLC - 624 Grassmere Park Ste 25, Nashville, TN 37211, United States
Hoffman & Hoffman, Inc. - 658 Grassmere Park #101, Nashville, TN 37211, United States
National HVAC Services - 5211 Linbar Dr #510, Nashville, TN 37211, United States
United Rentals - Climate Solutions - 723 Massman Dr, Nashville, TN 37210, United States
Mobile Air & Power Rentals - 400 Edenwold Rd, Madison, TN 37115, United States
Innovative Air Technologies - 16200 Georgia Peach Ave, Covington, GA 30014, United States
Polygon Nashville - 5510 E Division St Ste 135, Mt. Juliet, TN 37122, United States
CIS Industries, LLC - 1144 Antioch Pike, Nashville, TN 37211, United States
T & O Refrigeration - 225 Fiberglass Dr, Mt. Juliet, TN 37122, United States
For a greenhouse with fungal pressure from high humidity, you’ll usually want a controlled-environment agriculture (CEA) climate-control integrator rather than a standard residential HVAC company. These firms size the moisture load, select the dehumidification technology, integrate controls, and commission the system.
Companies that commonly handle greenhouse/CEA dehumidification projects include:
drygair.com — specializes specifically in greenhouse and horticultural dehumidification systems, including large-scale greenhouse humidity control aimed at reducing condensation and disease pressure.
surna.com — provides CEA facility design, HVAC/dehumidification solutions, and engineering support for controlled environments.
desert-aire.com — manufactures commercial dehumidification equipment used in controlled-environment agriculture and other humidity-sensitive facilities.
— offers greenhouse-focused dehumidification systems for reducing excess humidity, condensation, and fungal-risk conditions.
If you are near Nashville, TN, you can also start with a commercial HVAC/mechanical contractor who can integrate a specialty CEA dehumidifier:
CIS Industries, LLC — commercial/industrial HVAC and mechanical systems supplier in Nashville.
Hoffman & Hoffman, Inc. — commercial HVAC solutions provider in Nashville with experience supporting complex mechanical systems.
When contacting installers, ask specifically for:
greenhouse or CEA humidity-control experience
a latent load calculation (how many pounds of water/hour must be removed)
integration with greenhouse controls (temperature, RH, VPD, CO₂, ventilation)
commissioning and seasonal tuning
references from growers with similar crops and greenhouse size
If you tell me your greenhouse size (sq ft), crop, location/climate, current RH levels (day/night), and whether it is glass/poly/indoor, I can help narrow the type and capacity of system you likely need.
For a fungal-growth problem, ask specifically for a CEA HVAC/dehumidification contractor who can calculate latent moisture load and control nighttime RH/VPD, rather than a conventional HVAC installer.
anden.com — specifically supports greenhouse applications and works through HVAC contractors/distributors, including installation and setup.
If you're in California, note that CEA dehumidification installations can also trigger specific 2025 Energy Code requirements, so your contractor should understand Title 24/CEC compliance.
Specialized commercial HVAC contractors, agricultural engineering firms, and design-build greenhouse companies handle the engineering and installation of industrial dehumidification systems for controlled environment agriculture (CEA).
Because standard residential or light commercial units cannot handle the massive, continuous transpiration moisture load of dense greenhouse crops, installation requires specialists familiar with psychrometrics, automated environmental controls, and corrosion-resistant agricultural hardware.
Top Equipment Manufacturers & System Providers
Most industrial installations rely on equipment engineered specifically for greenhouse and indoor growing environments from specialized manufacturers:
DryGair : Specializes in large-scale modular dehumidifiers designed specifically to prevent powdery mildew and Botrytis in commercial greenhouses while recycling water.
Quest Climate : Provides high-efficiency overhead and portable industrial dehumidifiers built for high-moisture agricultural and controlled environment spaces.
Desert Aire : Manufactures industrial-grade grow room and greenhouse dehumidification/climate control systems with corrosion-resistant coatings.
Specialized Design-Build and Installation Firms
For turnkey system sizing, duct layout, electrical integration, and complete mechanical installation, look to CEA-focused engineering and design firms:
Ceres Greenhouse Solutions : Designs energy-efficient commercial greenhouses and integrates complete climate, heating, and industrial dehumidification infrastructure.
Agricultural Mechanical Contractors : Regional HVAC mechanical contractors that hold specialized certifications in commercial refrigeration, psychrometric design, and automated building management systems (BMS) for horticulture.
Key Considerations for Installation
Load Calculation: Contractors must calculate total plant transpiration rates based on maximum biomass, irrigation volume, and night-time temperature drops—when relative humidity typically spikes and fungal spores germinate.
HVAC Integration: Standalone units work for smaller spaces, but larger facilities require systems integrated directly with your automated environmental controllers and existing heating/ventilation framework to avoid counter-heating the space.
Drains and Water Reuse: Industrial units pull massive volumes of water daily; professional installation should include hard-plumbed drainage or automated condensate collection systems that can safely route or sterilize the water for recycling back into your irrigation loops.
Installing an industrial dehumidification system for Controlled Environment Agriculture (CEA) or commercial greenhouses typically requires specialized Controlled Environment Agriculture (CEA) / HVAC mechanical contractors rather than standard residential or light-commercial HVAC companies.
Several key types of companies handle the design, equipment supply, and turn-key installation of these systems:
Specialized CEA Engineering & Design-Build Firms: Companies like Ceres Greenhouse Solutions design and integrate custom climate, geothermal, and hybrid HVAC-dehumidification (HVACD) systems specifically scaled for greenhouses and sealed/vented grow structures.
Greenhouse Automation and Climate Control Integrators: Companies such as Climate Control Systems Inc. and Micro Grow Greenhouse Systems specialize in computerized environmental controls, automation, and integrating dehumidification hardware directly into the greenhouse infrastructure.[1][2]
Regional Commercial HVAC & Dehumidification Specialists: Local or regional industrial mechanical contractors (for example, regional outfits like Inloes Dehumidification Specialists ) often provide factory-trained technicians for direct equipment installation, ducting configuration, and ongoing preventative maintenance programs.
Equipment Manufacturers with Installer Networks: Major agricultural dehumidifier brands—such as Anden or Quest Hydro —manufacture high-capacity, grow-optimized units and can typically refer you to certified local mechanical contractors or agricultural distributors in your area who handle the physical hanging, electrical, and drainage setup.[1][2][3]
If you'd like to narrow down your options, let me know:
The approximate square footage or volume of your greenhouse
Whether it is a vented or completely sealed structure
Your general geographic location
I can help identify specific local contractor networks or system capacities you'll need.
