[img]/forums/images/icons/tongue.gif[/img] A GOOD, well-maintained, evaporative cooler can give you seventy-degree air on even really hot days. The trick is to MOVE AIR, and have very low humidity. CFM is a very important number in the equation, and the other consideration is being able to open the house to vent hot air without letting scum in that will rob and kill you, so this has to be designed in from the outset. Does anyone remember the old hotels that were AIR COOLED? The hallways were the suction so the transoms above the doors to the hotel rooms could be opened to let hot room air go into the hallways and then be replaced by cool night air entering through the open window. That was pre-air conditioning, and it was a BIG selling point to attract guests. As cities developed, the evapotranspiration from the trees that were planted caused the humidity to rise and that made it more difficult to cool with just night air and also reduced the effectiveness of evaporative coolers. [img]/forums/images/icons/tongue.gif[/img]