I live in a suburb of Memphis TN, gets very hot here during the summer. I have 2 tube integrated amps in my main system which is in a 25x19 foot room so smaller than yours mpoll1. One of the integrated amps is 845 tube based; the other 7189A/EL84M . It doesn't matter what the season , neither, and most specifically the 845, never leave me feeling that they are heating up the room; nor that the AC runs more in the summer because one or the other are on. Likewise, I have a KT88 integrated amp in my upstairs family room with similar footprint and that also doesn't heat up the room. Net net, your room is bigger than either of mine and I wouldn't think twice about the "heat issue" in your case. Cost wise I haven't ever attempted to size up the utility cost factor whether using tubes, or class A/B amps; I'm more interested in musical enjoyment. I will agree that the tube amps sound better after 30 minutes or so, and I begin listening after allowing the tubes to initially warm up for 10 minutes or so.
How hot is hot when moving from class a/b to to a or tubes?
I am considering moving from a class a/b Luxman L509x to a class a or tube amp.
I have never owned a class a or tube amp, so have no experience of living with one. My kids are hopefully old enough and wise enough not to burn themselves, but I do live in an already warm house with bifold doors leading to a south facing garden. There is no escaping the sun, despite having uv treated glass.
My room is roughly 9 meters by 12 open planed living space. Equipment is, Luxman L-509x integrated, Zu union 6 supreme, 99db sensitivity (this is why I am considering a lower powered tube I can barely turn the Luxman up) music is played roughly 6 hours a day, more on weekends
who here has moved from class a/b and d to class a with or without tubes. What were the differences of things like:
warming up time
additional heat to the home
Running in summer time
additional cost to run
any considerations I should make before purchasing something. I will try in my home, but will need to free up funds