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Evaporative Air Coolers—Highlights of Technology, Functioning & Maintenance

Evaporative coolers are used as an effective way to cool indoor spaces.  Also, called swamp coolers, these coolers pass it over water-saturated pads that cause water to evaporate into it. In areas with low humidity, evaporating water into air offers a natural and energy-efficient means of cooling.

Here are a few points that are necessarily important for sizing, selection, installation, and maintenance of Evaporative Air Coolers.

evaporative air cooler in india

SIZING AND SELECTION of Evaporative Coolers

The size selection of evaporative coolers is defined by cubic feet per minute of air that is being delivered by them to the house.

  • The most common range of Evaporative Air Coolers is 3000 to 25000 CFM.
  • Air moving capacity: 20 to 40 air changes per hour

INSTALLATION of Evaporative Air Coolers in India

The installation mechanism of evaporative coolers is defined in one of two ways-

The first cooler blows air in a central location: 

Such kind of configuration is suitable for compact houses, and they are open from room to room.

Or secondly, The cooler connects with the duct-work:

It distributes the air to different rooms. This kind of configuration is required for larger houses with hallways & multiple bedrooms.

Most of the time people install down-flow evaporative coolers on the roof of their houses. However, some experts choose ground-mounted horizontal units featuring easy maintenance and low risks of roof leaks.

Small horizontal flow coolers are installed in windows for a cooling room or a section of the home. Such portable evaporative coolers work well in moderate climates, however, they are not sufficient to cool in hot climates. Room evaporative coolers can reduce the temperature in a single room by 5 degrees to 15 degrees Fahrenheit.

OPERATION of Evaporative Air Coolers India

For efficient working, and an evaporative cooling mechanism, an evaporative cooler should have a minimum of two speeds and a vent only option. The water pump does not operate, and outdoor air isn’t humidified in the vent- only operation. Other than this, it also enables you to use the evaporative cooler as a whole-house fan during the mild weather.

Movement of cooler air can be controlled through the house after the adjustment of window openings. For providing openings upto 2 square feet for each 1000 CFM of cooling efficiency, windows or vents are opened on the leeward side of the house.

If windows are open too far, the hot air will enter, and if windows are not open far enough, there will be humidity created in the home. For controlling humidity and temperature across different areas, you need to keep opening & closing the windows accordingly.


If your cooler is maintained properly and timely, it saves you lots of time, work and money. Keep draining & cleaning your evaporative air cooler on a regular basis and ensure periodic removal of sediments & minerals.  Every season, there should be major cleaning. Also, the more cooler runs, the more maintenance it requires. Also, pads should be replaced a minimum of two times in a cooling season. Well! The evaporative coolers are very beneficial and economic as they require only minor to moderate setup. Other than this, it is based on basic cooling technology, known for cost-effectiveness and environment-friendly nature.

Published by ventech systems

Ventech Systems is an ISO certified manufacturer of ventilation, air conditioning control systems and air pollution control systems where quality is on high priority.

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