Well I don't have the luxury of a Chiller, So I use fans like DR.B mentions....Evaporation is the name of the game for low budget cooling...I use one I got at walmart...its a 2 speed with adjustable head on it...Name escapes me....but works good...when it gets real warm, I have a window AC unit I put in the room my tank is in and set for about 75 degrees and it seems to keep the heat at bay....all part of the fun with running MH and and VHO...woohoo!
Geo