Note cheap way to reduce heat for house, motel, slum on summer. Use water evaporation, fog generating, simple drop system... A/C and evaporate fan is quite expensive. In VN, a normal A/C for small slum cubicle room is ab 8m VND, small evaporate fan is ab 1.2m. So for ekonomic, our system should not be exceed 1m in budget. The solution have to match some bellow requirements: 1. Not over 1m budget. 2. Have to stable and simple to operate, safety, ie. electric short by water. 3. Do not affect health or house structure, ie. wall moisture... Finally we although qualify and test the system. Our goal is to cooling down the house, keep the whole thing as natural as possible. For example air should be clean as nature wind, keep the temperature in room same as possible. Because of as fan cooling does not as A/C, A/C is much more quality in the way heat balance, fan like chopper make heat randomly move around and make body feel panic and tired. A/C has some draw back too, at first the...