Here are my few Tips for have the Rig cool.
The best ist to have the rig in a cool place. I have them in the undergroundfloor, there it is the whole year cool.
I know a big fan which pushes the cold winter air inside the room to cool down the temperature a bit more that the fans are not so loud.
In the summer time I reverse the fan and push the hot air to the outside that It not start to getting warm inside.
This solution works perfekt for me. Nothing more is needed.