this is a project am right now working on it oddily more cheaper do this then buy ac at walmart or any wear else since ac sell around at least 200 dollars around here so this how it works /

first the barrel is the holding tank for the water as well the there the coolant rod witch keep the water cool up to a least a day or two from there water goes though the hose to the water pump to the heat exchanger coils witch mad out plastic instead of copper ( witch is so expensive it not funny ) the a double fan unit one be blowing air in the room the other be blowing the air out out the room pushing the air over the heat exchanger and the the same fan blowing the air into the room push that cool air back into the room ( this is a simple version of an ac )

am still trying figure what to use as a coolant for the coolant rod since ice will melt to dang fast in if you have any advice or comment am happy to listen to them and if you wondering way am doing this is because the attic fan to my home is gone out and one get tire sweating :P

( if you thinking about building one please tell me and show your design )