If you want a highly effective machine to cool your space, then get yourself a Window Swamp Cooler! Not only is this cooler easily affordable but also occupies a very small space in your home. It’s easily mountable on a window. Window cooler is also eco-friendly because it doesn’t emit ozone-destroying refrigerants like traditional air conditioners do.

window swamp cooler

Differences between window evaporative cooler and air conditioners

window coolerWhile evaporative cooling machines operate using the nature-given almost-free resources of air and water, traditional air conditioners use toxic refrigerant chemicals. evaporative air coolers, which are known to perform best in dry climatic conditions, consume only about 25% of the electrical energy used by AC units, getting rid of hot air and in its place in your target space bringing in fresh and cool air. With evaporative cooling systems, fresh air is re-circulated every 2-4 minutes while air conditioners maintain the same stale air in the room. In addition, their moist pads help relieve allergy sufferers by filtering smoke, dust, pollen and other allergens from the air.

In addition to being most efficient in dry climates, window evaporative cooler is also more cost-efficient than ACs. This is due to: 

– Operation costs:

Window evaporative cooling systems are three times more energy-efficient than ACs. As the resources which they use is air and water. 

– Costs of installation:

Evaporative coolers are easier and more affordable to install. No wiring. No venting. Costs here are typically 50-80% less than installing central ACs. 

– Environment-friendly:

Uses nature-given resources (water and air). Emits zero ozone-depleting ingredients. 

– Efficiency:  

The evaporative cooling system makes it high performance with low operating and installation costs

What is the Method for Evaporative Cooling


The operation of an evaporative cooling system applies basic physics principles. Dry air absorbs the resultant moisture from the process of evaporation. In the process of being converted to moisture during evaporation, water absorbs heat. Evaporative coolers use a kind of fan that is specially designed to help accelerate the process of evaporation, cool the air further and circulate the cooled air. 

You can test this principle by putting on a wet T-shirt and fanning yourself. In dry, low-humidity areas, you’d experience an immediate cooling/chilling feeling. On the other hand, if you live in a highly-humid region, you’ll simply experience a damp feeling.  

Although cooling by evaporation can be very efficient and cost-effective in a dry climate area, it wouldn’t be worth the effort and money in tropical regions or other areas known to experience high levels of humidity. 

Evaporative cooler machines require sufficient air flow and ventilation in the room. This air flow enables the distribution of cool air in the room while warm, moist air is expelled. This is why windows and doors need to remain open.

How window swamp cooler work

Window swamp cooler working

This picture shows a window swamp cooler, also called a window mounted evaporative cooler. Compared to roof-mounted cooler, window mount swamp coolers are more convenient for maintenance and reduce the chance of roof leaks.

Inside the machine, there is a centrifugal motor blower or fan blade whose role is to pull air through cooler pads and then discharge it into the target space via the box-like vent in the front. The front panel switches are used to control blower speed and a tiny pump motor inside the cooler’s housing. This unit also has a connection to a water line that supplies water its shallow bottom reservoir. As evaporation occurs, a simple float-valve controls the addition of more.

The key to efficient evaporative cooling

1. Cooling pads:went pad

 The key to the efficiency evaporative coolers lies with the design of their cooler pads, as well as level of humidity in the ambient air. Aspen pads are more affordable, easier to install and replace, more effective and more biodegradable than synthetic versions. But the latter last longer.Cellulose cooling pads are also known as honeycomb pads, mostly because they look like a honeycomb. They are thicker in comparison to aspen pads and have low maintenance and a higher life. They cost a little more but are also known to be more efficient.

2. Motor: 

Evaporative coolers are more cost-efficient than traditional AC compressors since they only have to pump air. No compressing of any refrigerant gas. A typical residential swamp cooling motor is just 1/3 to 3/4 horsepower. In comparison, a residential AC compressor is 3 to 5 horsepower. If we also include the AC fans needed for cooling and condensing, then we see that evaporative coolers consume much less energy.

Centrifugal fan vs. axial fans

The main versions of centrifugal fans include airfoil, forward-curved and backward-inclined. Axial fans are more efficient (80-90%) while centrifugal versions are about 50-60% efficient. So, if you want to buy an evaporative cooler, consider an axial airfoil fan, especially with the direct drive and the static regain cooling device versions.


How do I know if a window cooler will work for me?

First, visit the local building and home improvement store and consult widely. You may be surprised to learn that temperature and humidity levels in your area don’t allow for evaporative coolers.

Is a window evaporative cooler right for you?

This mostly depends on the levels of humidity and temperature usually experienced in your local area. As we mentioned earlier, evaporative coolers work best in dry climates.

In the first column of the table below, the figures represent outdoor (dry-bulb) temperatures. Then the numbers in the row located at the top of the table represent outdoor relative humidity (or RH).

The most optimum weather conditions for the efficient operation and functioning of an evaporative cooling system are located in the table’s upper left quadrant. Those conditions displayed in the blue boxes are marginal. Those conditions displayed in the other boxes immediately located under the blue ones are not suitable for evaporative cooling.

evaporative air cooler in optimal conditions

How to choose the size of window swamp cooler

Once you’re sure that you need a window swamp cooler, the next consideration is size. They are calibrated in cube meter per hour (CMH) or cube feet per minute (CFM). A small unit may be 3000 CMH, while a whole house unit will be 8000 CMH or larger. For instance, 6000 CMH can serve a huge residential house which 80 square meters of floor space with ceilings 3.5 meters. 

With up to 300 cubic meters of air being constantly pushed into the rooms, you need to leave windows at least partially open so as to allow for an exit path. Opening a 8 to 12 cm window in each room will provide ample circulation.

The Key Features of window cooler

1) Remote control Remote Control window cooler

Used to operate the machine e.g. turning the water pump on and off, raising or lowering fan speed, etc. 

2) Quiet operation 

Its blower motor produces little to zero noise. 

3) Overload protection evaporative cooler float valve

The cooler comes with an automatic thermal-overload switch that shuts off its motor if it overheats, then restarts it once it has cooled down. 

4) Waterless option

 You can turn the water pump off during cooler or very humid days. 

5) Durabilitywindow mount swamp cooler

 Its corrosion-resistant polyester protects the cooler’s metallic parts from rust even if exposed to weather elements. 

6) Continuous operation

 By connecting a water hose to the cooler’s water supply, you don’t have to refill it.

How to maintain the window mount swamp cooler

Window mount swamp coolers are quite easy to service and maintain. Any home-owner with some basic mechanical knowledge and basic tools like an adjustable wrench and a screwdriver can do it. This is unlike the maintenance of traditional ACs that is better performed by expert technicians. Its replacement parts are also easily available and inexpensive. 

Bonus Tip: Exercise extreme caution when working on your house’s roof. Again, turn off your cooler’s circuit breakers if you’re working on its electrical parts. Beware of thermostatically-controlled motor blowers and pumps because they can also turn on unexpectedly.


Take cooling your home to an eco-friendly and cost-efficient level with window swamp cooler. Reduce operating costs by up to 75% and save on installation while using the natural evaporation process of air and water to effectively cool your home. It can be installed in vertical or horizontal windows with included kit. Most effective in dry climates for spaces up to 90 square meters.

Once you have decided to get the window swamp cooler, that the next important step is to choose the brand. Some popular brands of window evaporative cooler are Honeywell window cooler, etc. While if you want to be an air cooler dealer and buy evaporative air coolers in bulk, you should consider the manufacturers to get a more competitive price and better technical support. Vankool could be a good choice for wholesale business since it has been the OEM supplier for Honeywell for more than 12 years and owns full range of evaporative cooler including window air cooler,portable air cooler and industrial air coolers.