I don’t have a lot of experience w many amps/gear, but I’m running a Krell Duo 300 XD class A 300 wpc. The unit stays cool the entire time at high DB levels pushing my Forte’s. The unit does have fans in the back, which I’m sure is frowned upon, but I can’t even hear them when the room is completely silent and I’m right near the amp. They also have an app to check the heat of the amp. Not really sure why they offered that for consumers.
As another option, I’m selling a pair of Jeff Rowland class D monoblocks (250 wpc). Zero heat and amazing build and look. Something like that would work perfect.