Once I listened to a Class A amp, many years ago, I never wanted to listen to anything else. Some of the older Class A amps used fans which increases your noise floor. The Sumo Gold I ran for a long time used to hit its thermal cutoffs in the summer so you’d lose a channel every once in a while and would have to shut it off until it cooled.
As I mentioned on other threads, I now own a Gryphon Colosseum stereo amp. I think it is one of the most beautiful amps I’ve ever seen and it doesn’t take up a lot of floor space because it is laid out vertically. It has two massive aluminum heat sinks.
What Class A amp are you considering?