I have ACInfinity fans on both my AVR and main power amp, they both run too hot, at least IMO, and the fans are an easy fix. My AVR temp goes to the point I can barely touch the rear of it after about an hour of operation, and the main amp, an old Onkyo with the giant green meters, just runs insanely hot without the ACInfinity on it, with them set at the 3rd level speed, I can barely hear them, and the temps are 80 F and 84-86F, running as loud as my neighbors can stand. Without them, the AVR is pushing 120F and the amp is like 140F. I'm about to do the annual cleaning of the dust and cat hair out of all my equipment, that seems to be the only negative to running the ACInfinity units, they suck a lot of dust into the stuff it's cooling.