This product is known as the Eco-Cooler!
It has the ability to reduce indoor temperatures as much as 5 degrees Celsius, which is on par with what an electric centrally installed air conditioning system can do. In some instances the Eco Cooler can reduce indoor temperatures from a sweltering 86F (30C) to a comfortable 77F (25C).
All this without any electricity!
I think it can be widely used in rural India!
It is reportedly the world’s first-ever zero electricity air conditioner, and its inventor wanted to get the concept out there to help as many people as possible.
The Eco Cooler method is fairly simple, from a construction standpoint.
A board is cut to fit the desired window, and bottleneck-sized holes are cut out in a grid pattern. The bottoms of empty plastic bottles are cut off and discarded, leaving funnel-shaped bottlenecks that are placed on the grid.
That’s all there is to the Eco Cooler, except for the task of installing it in place of the regular window. When mounted, the wider part of the bottles faces outward and catches the passing wind, literally funneling cool air into the building’s interior.
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