Recently finished an install where the customer was complaining of heat from their whole house audio system (we did not do the original install and the company that did would not return for service). The cabinet that housed the equipment was getting so hot that a mylar balloon touched the cabinet face and melted to the wood. Luckily the amps were not damaged due to heat and we were able to still use them.

To combat the heat, two fans and a thermostatic controller were added to cabinet. One fan was set to pull fresh air in and the other set to push the hot air out. With the thermostatic controller, the fans ramp up in speed as needed to keep the electronics at a cool operating temp.