Summer and its heat are unavoidable, but the heart’s desire to get a bit of cool breeze is inescapable. Although the main sufferer, mainly the rural Bangladeshis knew nothing could change their situation. Hence the intention was to provide a sustainable solution at a minimal cost.

So, the insight was actually a very simple science. If you blow with an open mouth slowly on your hand, it feels warm. But if you do the same lips pursed, it feels cold! This is all to do with what's happening with the air. If you're blowing through very narrow pursed lips, the hot air is compressed and turned into cooler air. Contrariwise, when you breathe with wide open mouth, the airstream is much wider and slower and doesn't grab as much ambient air.

Based on this simple principle, the creative idea was, Eco cooler – The World’s First Zero Electricity Cooler

As the huts are made with corrugated tin sheets, the inside and outside temperature were same. The hut’s window does not help much, but that’s the only place from where air can get inside the hut. So window is the place where it needs to be implemented.

So, the cardboard having the cut bottles on it was placed on the window for the trick to work. Hence some plastic bottles, a cardboard and simple physics did the work. The actual users were very surprised as the solution came to them like magic, although a trick which they themselves can do.

As the technique used were taught to these people, making it a public property so whoever wanted could make it by themselves.

The campaign was implemented in 5 villages around the northern belt of Bangladesh – where a team of Grameen Intel officials had village sessions on how to build the Eco-Coolers. Due to the simplicity of the product design, the product soon started to be mimicked by villagers and be adopted by villages across Bangladesh.