How to keep your greenhouse ventilated with cooling systems?

Owning a greenhouse means lots of responsibilities and it is no surprise that the question of what methods are available for cooling the interior will come up. A canny combination of shade, ventilation and humidity is highly important to keep the greenhouse in its flourishing form. As a cultivator, one will have a lot of choices in the design of the greenhouse structure and on how much control required for the crop they are growing. However, one foremost function for constructing a glasshouse structure is to build a climate-controlled environment in order to benefit from optimum growing conditions compared to growing outside in a non-controlled environment. When it comes to greenhouse cooling, there are quite a few options, but did you know that evaporative cooling system proves to be effective compared to all others.

Evaporative cooling

Depending on the place, temperatures can simply surpass 100°F, if not equipped with cooling systems, with intense heat; greenhouses have all possibilities of drying out especially during the summer season. Additionally, it results in poor crop quality and worker productivity. With installation and operating costs of air conditioning or refrigeration systems usually being prohibitive, evaporative cooling systems are considered by greenhouse growers for reducing the temperature inside a greenhouse.

Evaporative cooling for greenhouses relates to a combination of evaporation of water, either by re-circulating evaporative pad cooling systems or by high-pressure fog systems, sometimes they are done solely as well.


  • Productivity of the greenhouse is said to scale up
  • The growth of the plants is speedy
  • Keeps constant humidity levels
  • Lower water consumption for the irrigation
  • Suitable for chemical spreading (fertilizers, insecticides)
  • Less shading needed

High pressure fogging

Both, naturally and mechanically ventilated greenhouses are said to have the utmost benefit of high-pressure fog systems and they are a very efficient way to cool and control the environment. It works on a theory called psychometric calculations, wherein it takes into account the ambient weather conditions, ventilation rate of the greenhouse location and other design features of the structure for properly designing the system. With very little or no structural modification, compared to the pad systems, it makes use of less water, however, corrects the vapor pressure deficit from time to time.

Greenhouse humidification

The humidification of greenhouse is imperative for the reason that photosynthesis is slowed or stopped when humidity levels are low. This in turn becomes stressful to plants, as their leaves are incapable to exchange moisture, oxygen, and CO2. Ideally you will have to choose between

  • Greenhouse Humidification fans- Highly economical, they are simple to operate and have it around your greenhouse, through evaporative cooling and movement of air, they are capable of cooling more than a 35 degree, and up to 100% humidity level. Making use of high speed fans and centrifugal force to squirt a fine mist of 25 micron water dewdrops, it stirs the air at the same time. Installing these units is said to give your greenhouse good air movement for even temperatures and adequate misting for cooling and humidification. They are ideal for orchid cultivation, vegetable and fruit storage, growing centers and more.
  • Misting Fans- With higher level of air movement, you can choose misting fans, allowing powerful air circulation that your greenhouse needs, these fans can bring up to 13000 cfm (cubic feet per minute) of wind. By this means, the hot spots are eliminated while paving way to spread cool air around the structure evenly, additionally you will have the advantage of the mist only, mist plus fan, or fan only options as well. Depending on the requirement you can have low pressure, mid pressure and high pressure fans which will vary and it can produce a mist so fine that it instantly evaporates accordingly. Just like how a sponge sucks water, this evaporation sucks heat and the end result is amazingly cooler greenhouses.
  • Misting Systems - Provide incredible greenhouse cooling, with misting systems; you can go for this option, if you feel that you are already employed with proper air circulation. This helps you to control temperature and humidity. It works by way of evaporative cooling, where the misting pump forces water through misting lines at high pressure to smaller nozzles stretched down the ceiling or structure of your greenhouse. Fine mist created gets evaporated into the air and as a matter of fact, you can achieve much higher humidity levels in addition.
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