I got some fans for piece of mind.
Set mine On at 85 and Off at 80 degrees F.
This what I use to suck the warm air out, not trying to cool the the Marantz/power amp by blowing air in.
and the dual thermostast controller
Work very well, but it add lots of cable management to do.
If you go that way, I strongly sugest you spend a few more bucks for cable management on longer probes.
Also, what I did was to put a piece of heat resistand tape to hold the probe wire agains the the fan and give it a little bend so you probe is where you want it to be, right next to the fan.
Some may differ, but for me a couples of hundred bucks includind $50 for shipping to Canada was worth the piece of mind for my equipment to never over heat.
Also, read my post #10095 on pg 337 from a paste and post from a friend of mine who is an electronic engineer who also use fans.
It works flawlessly, affords peace of mind, and its quiet too.