Using the principles of fluid dynamics people have made an incredible solution for cooling without electricity(DIY – Low Cost Bottles Air Conditioner Idea). When the air passes through the narrow space, it is under more pressure and move faster. Than the air is cooler compared with the air that passes through wide space. So this is used to make air conditioning that works with no power but with minimal air circulation. This Eco Cooler is great solution for the places in the earth where is no or very poor electricity net. It uses a board with many 2 liters bottles on it.