Top reasons to cool a commercial greenhouse using a high-pressure fog (extremely fine mist) system?


The best commercial high-pressure systems:

1. Create a very fine (10 micron max size) water droplet which quickly evaporates. Operating at 1000 psi creates ultra-fine water particles which instantly evaporate.
2. Designed to uniformly cool or humidify greenhouse, bay or climate zone. No hot spots or drop-off points.
3. Strictly influences the ambient air condition without wetting. Does not wet, water or condense onto plants or canopy.
4. Uses the existing temperature and humidity to create a precise cooling level. The ambient heat profile is used as energy for the evaporative cooling. System slows or speeds delivery when necessary.
5. When configured properly, can add cooling to almost any environment. Solves cooling problems for all but geographies with the highest relative humidity.
6. No additional compressors or cylinders and is low maintenance with quick adjustments.
Simple preventive maintenance routine, change filters as needed, seasonally or annually. Rotating nozzles allow for directional hand adjustments of mist.
7. Easily managed & controlled. Used independently or easily integrates into greenhouse control system.

High-Pressure Fog Benefits Greenhouses

The very small particle droplet created by a combination high-pressure fog system and small-orifice nozzle system provides consistent, instantaneous evaporation and subsequent cooling across the entire greenhouse or for independent climate zones and bays. Used in conjunction with a temperature and relative humidity sensor, the greenhouse controller maintains cooling without overshooting the humidity level. This keeps the air within the required temperature and humidity range without creating drips, droplets or condensation. The system will add fog in large or small increments to control the greenhouse environment for precision cooling. Greenhouse control systems manage humidity levels with ventilation options such as fans and louvres.

Control Greenhouse Cooling

Add fog when needed for higher ambient heat. Heat spikes are managed easily because the system adjusts to meet the necessary cooling. Desert conditions react well with fog cooling systems but almost any greenhouse can benefit from instant evaporative cooling taking weather data into consideration.

Add Cooling, Not Wetting or Watering

A smaller droplet size is created using the combination high-pressure system and small orifice nozzle size. Greenhouse cooling research has shown that a small droplet size evaporates more quickly than larger droplets.(1) This combo delivers ‘fog cooling”—not wetting or watering. Instant evaporation means there is less worry about wetting and waste. Maintenance is simple and easy and when used in conjunction with reverse osmosis water, mineral deposits are less of a concern depending on local water properties.

Greenhouse Cools Immediately

Given the design of nozzle configuration and instant evaporation of very fine water particles, once released into the air, fog cools the greenhouse immediately (temperatures usually start dropping within 6 to 8 seconds).

Cooling Across Entire Greenhouse

Custom-design of the high-pressure system creates fog cooling across the entire greenhouse space. Cooled air from typical wet wall, pad and fan setups declines as the air travels away from the wall. Distributed throughout the space and intrinsic to the system design, high-pressure fog instantly evaporates to bring temperatures down immediately. The combination of a high-pressure system, small orifice size of nozzle plus controls that manage how often the fog is released, creates cooling across the entire greenhouse. A system that keeps the cooling level consistent and humidity in an acceptable range is what makes this type of system unique.


References used for this post can be found below.


Do you need an expert team to guide you on high pressure greenhouse cooling systems? Do you need a system custom-built for your facility? Speak with one of our friendly experts today!

Contact us for a free quote.

phone. 1-800-322-4364 or 1-760-322-1111 | email. fog at



1. Kuack, D. (2013, June 5). Natural Ventilation and Fog Increase Cooling Efficiency. Greenhouse Grower.

2. Linker, R. (Technion- Israel Institute of Technology),  Arbel, A. (Agricultural Research Organization, The Volcani Center), Kacira, M. (The University of Arizona), Gutman, O. (Technion – Israel Institute of Technology). (2011). Design and Validation of Robust Controllers for Fog and Ventilation in Mechanically Ventilated Greenhouses. Written for presentation at the 2011 American Society of Agricultural and Biological Engineers Annual International Meeting, Louisville, KY. (PDF downloaded from Research Gate 8/6/2021).