My tank has always had problems with heat, everything is sealed up so it holds the heat in. Even in the winter the tank will reach 82 degrees without cooling. I don't like the idea of chillers and simply running fans produces way too much humidity in my place. So I build an evaporative cooler that allows me to vent the humid air outside.
I connected a 3" PVC pipe line to connect the cooler exhaust air to an outside vent.
The cooler is capable of lowering my tank temperature up to 4 degrees in normal conditions, works very well in the winter but I'm yet to find out how well it works in the summer with the extra heat and humidity. So far I've had to keep the room temp below 25 degrees C.