Temperature & humidity are two of the most important greenhouse climate parameters.

In order to grow healthy, active plants, and produce large, high quality yields, growers need the right tools to control both.

DryGair has designed an innovative greenhouse heating and cooling solution to control both humidity, and temperature, in an energy efficient manner. This solution offers a way to control climate conditions, utilizing significantly simplified infrastructure, compared to alternatives.

DryGair’s DG-12 and DG-6 Heating & Cooling Units
Provide Multiple Functions
DG-12 / DG-6 Heating & Cooling

The heating and cooling option can gradually increase or decrease temperatures alongside advanced humidity control.

Heating & cooling is available for DG-12 and DG-6 units.

The DryGair Solution Combined with Heating & Cooling – How it Works

Our growing concept is based on closing the greenhouse, fully deploying thermal screens (if applicable), and operating the DryGair unit inside the space. DryGair treats the air and circulates it throughout the greenhouse, creating optimal, uniform conditions.

Cannabis grow room with Drygair

DG-12 or DG-6 Heating & Cooling Unit Structure

Greenhouse Heating & Cooling – Temperature Control

DryGair combined with heating & cooling requires an electricity supply, a drainage pipe for extracted water, and
a hot or cold water supply.

The unit is equipped with inlet and outlet water pipes, which connect to the hot or cold water coil. These pipes must be connected to a water source (chiller, boiler, heat pump, etc.).

Hot/Cold Water Coil

While operating in heating or cooling mode, the air passes through the hot or cold coil.
The temperature is determined by the temperature of the water supplied to the unit:
Heating & Cooling Capacity

The heating or cooling capacity depends on 3 variables:

  • Temperature of the water inserted into the unit
  • Water flow rate
  • Existing climate conditions


DryGair combined with heating has a high heating capacity and can be used as an alternative for heating systems.

The heating capacity of the unit increases as greenhouse temperatures are lower.

This simple system can replace the heavy infrastructure, maintenance, and costs associated with alternative, conventional heating systems, providing comprehensive climate control.


The DryGair cooling function offers a solution for plants experiencing heat stress due to high temperatures. The cooling solution creates cooler night time conditions, which contrast with hot days, creating daily temperature averages that promote better plant development.

The cooling capacity of the unit increases as temperatures are higher. A portion of the cooling capacity is used to neutralize the heat released by the unit’s operation.

Cooling the greenhouse overnight allows plants to decrease their respiration rate, directing more of the valuable resources it produces throughout the day, to the parts that most need them, such as flowers and fruit.

DryGair combined with cooling can supply a gradual reduction in temperature during night time operation. This is a big advantage over alternatives, such as wet pad and fan systems which raise humidity and can lead to mold and disease outbreaks, or costly HVAC systems, which require large amounts of energy to lower greenhouse temperatures.

Heating/Cooling Capacity Examples:
Advantages of DryGair Combined with Heating & Cooling

In Summary

The ability to control humidity and temperature in complex agricultural environments, in an energy efficient manner, is DryGair’s speciality.

The heating & cooling units offer a growing tool that supports all climate control aspects required for commercial cultivation. The unique design optimizes growing conditions – increasing yields and quality, while saving on energy and preventing diseases.

DryGair Heating & Cooling Video Tutorial

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