Greenhouse Water Management  

Chilled Water Cooling & Humidity Control

Cannabis growers and researchers are turning to chilled water cooling systems for precise cooling and environmental control of indoor and greenhouse growing operations. The goal when growing a specialty crop such as cannabis is to tightly control the growing environment. Whether yours is a large or small cannabis growing operation, Delta T’s DeltaCool™ Environmental System offers the best in precise temperature and humidity control.

Considering a hydronic system? Hydronics uses water as the heat-transfer medium in heating and cooling systems, offering more precise control of the growing environment. The system is versatile, and it may include both a chilled and heated water loop to provide for both heating and air conditioning. Chillers and cooling towers can be used separately or together to provide water cooling, while boilers heat the water.



Chilled Water for Humidity Control

A chilled water cooling system, such as the DeltaCool™ Environmental System, is a hydronic process by which chilled water is circulated through a loop piping system. Circulator pumps force the water through a heat exchanger, where a fan draws warm air out and cools it as it passes over cold coils. This customizable system can accommodate many growing practices, as it may be broken up into individual temperature zones using either multiple circulator pumps or a single pump and electrically operated zone valves.

Like a radiant heating system, chilled water cooling is controlled and regulated by the environmental controls, allowing growers to precisely control the temperature and humidity levels of the growing facility as well as other climate factors. Direct digital controls not only provide precise environmental control, but also allow for energy and cost savings.


Less Humidity than Evaporative Cooling

Most commercial greenhouses use evaporative cooling, which can cool air to about 10 to 20 degrees below the outside temperature. Evaporative cooling systems lower air temperature using mists, sprays, or wetted pads. Introducing water into ventilation air increases relative humidity while lowering air temperature.

The typical evaporative pad cooling system draws outside air into the building through wet vertical pads. As air flows past the moist pad surfaces, some of the moisture evaporates into the air stream. Heat is withdrawn from the air during this process and the air leaves the pad at a lower temperature with higher moisture content.

Standard systems dehumidify to the point of 10 to 20% relative humidity when cooling for long periods of time, but this is too low for proper growth and production. The DeltaCool™ Environmental System controls relative humidity better because it provides both cooling and humidity control, without dehumidifying to the extreme.

The process DeltaCool™ offers also cools the air to a temperature at or around dew point to avoid condensation of the air and excessive humidity. This gives growers the assurance that their crops can grow in a healthy, high yield environment.


Customized Cooling Solutions for Growing

DeltaCool™ chilled water cooling provides precise control and is typically developed as a custom solution for each operation. We suggest growers consider multiple factors when selecting chilled water cooling systems:

  • Installed cost
  • Energy consumption
  • Space requirements
  • Freeze prevention
  • Precision
  • Growing area height, size and shape
  • System cooling and heating capacity
  • Centralized maintenance
  • Stability of control


Learn More: Click here to download PDF.

Discover how your operation can benefit from chilled water cooling. Contact us at 800-552-5058 or email


Delta T Solutions
27711 Diaz Rd, Suite B, Temecula, CA 92590 • 800.552.5058 • 760.682.0428 (fax) •