I can say in day to day use any electronics that run hot get annoying for that reason soon enough. A hot Summer day, Air conditioning going full blast and you want to listen to some music. but DON'T because the amps or whatever are blazing hot to run??? Then the folks who own a second amp for Summer use? Because the favorite is a furnace? Reason enough to avoid Class A amplifiers and big tube amps.@elizabeth
There is no need for air conditioning to control the heat of the room when hot amplifiers are in use! A simple means of dealing with that is to install a vent and fan system, using flexible ductwork and a low speed fan that runs silent. The vents are installed above the space where the amplifiers reside. The heat goes up and out the vents. Cheap, efficient and effective.
I have a customer in Guatemala that does this with our MA-3 power amps (triode class A 500 watts) and without any air conditioning at all and his listening room stays comfortable 24/7. He hid the vents in the ceiling along with his lighting by using a teak lattice (teak is cheap in central America) which looks quite nice. The vent setup cost him about $200.00 and can't be heard.

