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HVAC and Dehumidifiers

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Create Your Perfect Cannabis Environment.

HVAC and MEP design are not a one-size-fits-all approach. We will guide you towards the ideal environment for your cultivation strategy with deep engineering and cultivation expertise. Our Surna partners’ have over 14 years of experience to bring to your grow room and build your environment right.

HVAC and MEP Engineering

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Gain Full Control of Your Production Environment

Climate control systems impact every layer of your business. From CapEx/OpEx/Revenue to plant outcomes your system must be configured to achieve the best results.

Overcome Yield Challenges and Stay Ahead of the Curve

Temperature, humidity, air circulation and VPD are challenging factors to control. Yields are sensitive to these environmental factors. Our HVAC and environmental controls streamline these difficult factors to manage, setting a strong backbone for your business.

Take Care of The Essentials with Experienced MEP

Success is in the details when it comes to highly controlled environments. Our experts will consult on your mechanical, electrical and plumbing with proven experience geared for commercial cultivation.

Protect Your Business from Harmful Organisms

Secure your investment by keeping your environments clean and free of harmful organisms. We offer photocatalytic oxidation, ionization and HEPA filtration that can be integrated with your climate system.


Trusted Engineering

14+ years cultivation engineering expertise

Biosecurity Solutions

Reduce the impact of harmful organisms

Consistent Production

Consistent climate for consistent crop outcomes

Standalone & Integrated Systems

Low-cost and precision options available

Equipment Financing

Easily purchase, finance or rent equipment

Installation Support

Our commissioning managers work for you



2-Pipe Chilled Water Dehumidification

Hydronic cooling is simply the removal of heat and moisture from a space utilizing chilled water as the heat exchange medium. People sometimes confuse chilled water systems with evaporative cooling which introduces humidity into the space and consumes water to cool, but they are quite different.

hydroponic cooling system
Product Features

Hydronic cooling systems are completely closed loop meaning no water is added to the space, much like the radiator in a car. In hydronic cooling, water is chilled by a chiller, dry cooler, or cooling tower and circulated via pump through the system into heat exchanger units in the space (air handlers or fan coils) and then back to the chiller to be recirculated again. Air handlers and/or fan coil units utilize a fan to pull warm air in and over the heat exchanger inside. As warm air in the room moves over the heat exchangers, heat is transferred from the air into the cool water inside the coils, pulling heat and humidity from the room and returning cool, dry air to the space. Since pumps keep water inside the system constantly moving, the warm water leaving the heat exchanger is immediately returned to a chiller, dry cooler or cooling tower.

Chiller systems are used worldwide for cooling in high-heat applications because of their top-of-the-line energy efficiency and flexibility for mechanical air conditioning and dehumidification. By decoupling the machine that is producing the cooling away from the indoor environment, it is possible to move cooling to the places that need it, when they need it, thereby “right” sizing the equipment for the overall building and not oversizing individual equipment for each space based on maximum loads in each.


Resources: http://surna.com/content/uploads/2020/07/2-Pipe-Chilled-Water-Pros-and-Cons.pdf

Contact a GroAdvisor today to learn more.

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4-Pipe Chilled Water Hydroponic Cooling System

The 4-pipe chilled water system is also a hydronic cooling system (like the 2-pipe system), but it utilizes both a chilled and hot water coil. The distribution piping runs to terminal fan coils or air handlers, which use chilled or hot water to change the air temperature by cooling, heating or dehumidifying it.

hydroponic cooling system
Product Features

Traditionally these systems utilize air handler units (AHU’s) or fan coil units (FCU’s) which contain a blower, heating or cooling elements, and control valves (and optionally, filter racks, and modulating dampers) . AHU’s and FCU’s can either:
a) be connected to a ductwork system that distributes the conditioned air to the area served and reside outside the space, or
b) reside directly in and condition the space served without ductwork.

4-pipe chilled water systems provide the ability to economize via a dry cooler in colder climates saving significant amounts of energy by turning off the compressors in the chiller, which are the single largest energy consumer in the HVAC system.

The most energy efficient 4-pipe designs utilize heat recovery on the chiller plant to minimize or eliminate dehumidification reheat costs.

Contact a GroAdvisor today to learn more.

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DX with Standalone Dehumidifcation

DX with standalone systems mean the cooling and heating unit is separate from the dehumidification unit, usually located in the space it serves. The most common types of standalone DX systems are split systems, mini-splits and packaged roof top units (RTUs). Common types of dehumidifiers used are standalone electric, or desiccant in low humidity applications. These systems typically supply cooled or heated air to a single zone in grow applications. The typical capacity is from 1 to 10 tons (split units) or 10-30 tons (packaged units), but they can be larger in some applications.

surna dehumidification
Product Features

Split systems are made up of two parts: an indoor fan coil unit (FCU) or small air handler, and an outside condensing unit. The FCU takes the warm air from inside your grow over cold evaporator coils, which contain refrigerant, absorbs the heat from the air inside the space, and transfers it to the condensing unit outside the grow to be rejected.

Packaged units operate similarly to split systems. The primary difference is that packaged units have all the components of the air conditioning system all in one place, contained in a “package” located outside the building (most commonly the roof).


Resources: http://surna.com/content/uploads/2020/07/DX-with-Standalone-Dehumidification-Pros-and-Cons.pdf

Contact a GroAdvisor today to learn more.

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Complex DX with Integrated Dehumidification via Hot Gas Reheat

As noted above, in this type of system, cooling, dehumidification and heating all happen directly to the airstream serving the space. The system uses a refrigerant vapor expansion and compression cycle to cool and dehumidify the air coming from the space and returns it to the room after conditioning. Here we will discuss the complex integrated system with the dehumidification/cooling/heating all in one unit.

surna hvac system
Product Features

These units cooling and heating functions are the same as standalone DX systems, however the dehumidification function is combined into the same unit, so they work in concert. There are two forms of hot gas reheat. There is an on/off type with poor discharge air temperature control (but cheaper) and complex modulating which offers better discharge air control but is more expensive.

Contact a GroAdvisor today to learn more.

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Modulating Hot Gas Reheat

Modulating Hot Gas Reheat (MHGRH), the more complex form of reheat, allows the precise control of the HVAC system discharge air temperature and is typically used during dehumidification mode.

surna hvac
Product Features

During dehumidification, mechanical cooling lowers the temperature of the air to a specific dewpoint in order to lower the moisture content of the air. MHGRH is then used to temper (raise) the temperature of the air to a desired setpoint that is equal to the room’s temperature setpoint. A common solution is a sophisticated RTU with integral dehumidification via modulating hot gas reheat. These RTUs have a vast array of efficiency, sizes, features, and costs.

Contact a GroAdvisor today to learn more.

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“If we didn’t have Surna and the support behind that, we would have made a lot more mistakes along the way, probably lost a lot more crops, and we wouldn’t have been able to deliver as high a quality of crops as we’ve been able, as soon, to the market. That was really big for us.”

Nic Borst

Owner, Durango Cannabis Company

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