One issue with using AC Infinity S/T cooling units (especially with Denon and Marantz models) that I just realized is the fact that the hottest part of the AVR/AVP is the video card which is generally located in the back left of the AVR/AVP; however, the probe on the AC Infinity S/T models is located about 3" back from the front center. As a result while you may have the thermostat set for 85F, it's measuring the front of the AVR/AVP while the back side of the unit is still at least 10-15F warmer and at least 95F.
I just ordered one of these for my Marantz SR6011. I noticed it was getting extremely hot on top even though my equipment rack is open on all sides. The Marantz is being used to power my rear 2 channels and 4 atmos speakers. By comparison, my Emotiva XPA-5 is barely warm even after a long watching session.