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Evaporative Cooler in High Humidity for Indoor Cultivation


Humidity control is crucial for indoor cannabis cultivation. High humidity leads to mold and mildew, which harm indoor cannabis crops. To regulate humidity levels and prevent damage, growers can use evaporative coolers.

Let's learn about the benefits of using an evaporative cooler in high humidity environments for indoor cannabis cultivation.

Understanding Evaporative Cooling

Evaporative cooling is a natural process to lower the surrounding area’s temperature, and it occurs when water evaporates into the air. An evaporative cooler uses this process to cool the air in a room or building.

The cooler pulls in warm air and passes it through moist pads. The water evaporates as the air passes through the pads, causing the air temperature to drop. The cooler then circulates the cooled air back into the room.

Using Evaporative Coolers in High Humidity Environments

Evaporative coolers are useful for reducing air temperature, but can have challenges in high-humidity areas. If the air is moist, the evaporative cooler cannot evaporate enough water to cool it.

To use them efficiently in humid environments, users should keep in mind these things:

  • Proper installation and placement
  • Adjustment of the airflow and humidity settings accordingly
  • Monitoring humidity levels
  • Regular cleaning and maintenance of the coolers
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What is an Evaporative Cooler?

An evaporative cooler, also known as swamp cooler/box, evaporative air conditioner, desert cooler and wet air cooler. It is a device to cool down air temperature through the water evaporation. It works by taking in warm, dry air and passing it over a wet surface.

Next, we'll explore the physical principles, applications, designs, types of installations and comparison to other types of air conditioning of evaporative coolers.

Physical Principles

When water is exposed to air, it will evaporate and cool the air around it. Low humidity and dry conditions are ideal for the procedure since they allow for greater water absorption by the air.

See the details of Physical Principles below:


Evaporative cooling has several cost-effective uses in moderate humidity areas, besides its common use in dry climates.

  • Use in industrial and commercial application:

Plants, commercial kitchens, laundries, dry cleaners, spot cooling in loading docks, warehouses, factories, construction sites, athletic events, workshops, garages, and kennels.

  • Use in agricultural application:

greenhouses, grow rooms, farming like poultry ranches, hog, and dairy farming.

Tips: Where in the U.S. are Evaporative Coolers Suitable?

Evaporative coolers work best in hot and dry climates with low humidity. So, in the United States, they are commonly used in:

Southwestern areas: Arizona, New Mexico, and California

Western and mountain states: Albuquerque, Denver, El Paso, Fresno, Salt Lake City, and Tucson.

However, users should consider the detailed climate conditions when choosing evaporative coolers when humidity increases and need extra cooling solutions.


There are two main evaporative cooler designs: direct and indirect.

Types of Evaporative Cooling


Direct Type

Blows hot air over a wet pad or filter, commonly used type

Indirect Type

Uses a heat exchanger to cool air, more effective in humid environments.

Comparison to Other Types of Air Conditioning

Comparing to the traditional types of air conditioning units, there are four features of evaporative coolers in high humidity :

Key Aspect

Evaporative Coolers

Energy Efficiency

75% less energy than AC, using only a fan and pump to function

Environmentally Friendly

Avoid harmful refrigerants and emissions, eco-friendly cooling solution

Better Air Quality

Reducing respiratory issues and skin irritation in dry climates in dry climate

Green Alternative

Cost-effective and environmentally responsible, but only suits some application with extra cooling method

How to Install Evaporative Cooler in Cannabis Grow Room

Proper installation of an evaporative cooler is essential for optimal cooling and humidity control in a cannabis grow room. Here are some steps to follow when installing an evaporative cooler:

  1. Choose the right location: The cooler should be placed in a central location to ensure even cooling throughout the room. It should also be placed near a window or vent for proper ventilation.
  2. Install the water supply: The cooler needs a continuous water supply to operate. Connect the water supply line to the cooler and ensure sufficient water pressure.
  3. Install the cooler pads: The pads are a critical component of the cooler and should be installed properly to ensure even cooling. In addition, they should be wet before turning on the cooler.
  4. Turn on the cooler: After the cooler has been installed and the pads have been wet, turn on the cooler and make any necessary adjustments.

Calculation of an Evaporative Cooler Size

To determine an evaporative cooler size for a cannabis grow room, calculate the cubic feet per minute (CFM) of the cooler. Here's an example:

Measure the length, width, and height of the room in feet.

Multiply the length, width, and height together to get the total cubic feet of the room.

Divide the total cubic feet by 2 to get the CFM of the cooler needed.

For example, if a cannabis grow room is 10 feet wide, 10 feet long, and 8 feet high, the total cubic feet would be 800 (10 x 10 x 8). Therefore, dividing 800 by 2 would give a required CFM of 400.

Note: the calculation example is just for quick selection. To make an accurate calculation, you should consult an HVAC professional to get your specific cooling solution.

Maintenance and Cleaning of Evaporative Coolers

To maintain and clean an evaporative cooler, here are some additional tips and key points to consider:

  • Clean the Water Distribution System

Regularly clean the water distribution system of the cooler to prevent mineral buildup and clogs. This includes the water pump, water lines, and water reservoir. You can use a solution of vinegar and water or a specialized cleaner to remove any buildup.

  • Check and Replace the Pads

The cooling pads of the evaporative cooler should be checked regularly for wear and tear and replaced as necessary. Damaged or worn pads can reduce the cooler's effectiveness and lead to mineral buildup. When replacing the pads, make sure they are the correct size and type for the cooler.

  • Clean or Replace the Air Filter

Clean with water or replace the air filter every few months to ensure proper airflow and prevent the buildup of dust and debris.

  • Use Water Treatment Additives

You can use water treatment additives to prevent mineral buildup and scaling in the water distribution system.

  • Address Problems Promptly

If you notice any issues with the cooler, such as cooling capacity reduction or unusual noises, address them promptly. Contact your dealer or manufacture for help, delaying repairs or maintenance may lead to further damage or shorten the lifespan.

Ambient Temperature Effect on Evaporative Coolers in High Humidity

Evaporative coolers work well in hot, dry climates but may struggle in high humidity or cooler temperatures. External ambient temperature significantly affects their cooling capacity.

  • Effect of High Ambient Temperatures

When it's too hot outside, cooling pads may underperform, causing increased humidity and reduced cooling. The water may also evaporate quickly, needing frequent refills.

  • Effect of Low Ambient Temperatures

In colder conditions, evaporative coolers might not adequately cool the air and could raise humidity levels, potentially harming cannabis plants.

  • Tips: How to Achieve Optimal Cooling and Humidity Control?

Adjust evaporative cooler settings based on external ambient temperature. Higher airflow and humidity settings work well in hot, dry climates, while lower settings suit cooler, humid environments, so that growers can achieve optimal cooling and humidity control for cannabis plants.

Benefits of Evaporative Cooler in Indoor Cannabis Cultivation

An evaporative cooler provides a variety of benefits for indoor cannabis cultivation in high humidity environments:

  • It's a more energy-efficient method of cooling compared to traditional air conditioning.
  • Evaporative coolers add moisture to the air, benefiting cannabis plants in low humidity environments.
  • Evaporative coolers can help prevent mold and mildew, which can devastate an indoor cannabis crop.

Conclusion About Evaporative Cooler in High Humidity

An evaporative cooler in high humidity environments can be valuable for indoor cannabis cultivation. Growers can control humidity and prevent crop damage by understanding how evaporative cooling works, properly using and maintaining the cooler.

With the right equipment and knowledge, indoor cannabis cultivation in high humidity environments can succeed.

FAQ About Evaporative Cooler in High Humidity

1. Can I use an evaporative cooler in all high humidity environments?

Not all high humidity environments are suitable for evaporative coolers. If the air is already saturated with moisture, the cooler will not be able to effectively cool the air. It's important to monitor humidity levels and adjust the cooler settings accordingly.

2. How often should I clean and maintain my evaporative cooler?

Regular maintenance and cleaning are crucial for the effective operation of an evaporative cooler. It's recommended to clean the water distribution system, check and replace the pads as necessary, and clean or replace the air filter every few months.

3. Can evaporative coolers work in conjunction with air conditioning units?

Yes, evaporative coolers can work in conjunction with air conditioning units to provide effective cooling in high humidity environments. By using the evaporative cooler to add moisture to the air and the air conditioning unit to remove excess humidity, growers can achieve optimal humidity control.

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