To Hot to Handle?

I have a VAC avatar super doesn't run hot real easy to bias too
in your price try a belles intergrated $22-2500 new

I have a small solid state amp (Forte' 4a) that runs pretty warm, and I leave it on all the time. I have air, but the thought of trying to deal with a real 'heater' amp in the Summer with no air is a challenge. The heat it produces will be an issue. But if you leave the windows open and use fans... you may not notice much of a difference. Windows closed, you are asking for trouble.
Also, does your electrical supply stand up to the task of running a big amp. (no air conditioning = old building, poor electrical service?)

Is a portable floor standing a/c unit an option? They are effective, and not inordinately expensive.

Also, my upgraded Counterpoint SA-20 amplifier has only two tubes-runs relatively cool, and sounds great.

Other hybrid amps are available that have a tube sound without a large number of tubes.

If heat generation is a major factor to consider, the obvious solution is a digital amp, which are said to exhibit sonic characteristics similar to tube circuits. My CarverPro ZR1600 (good for 600 wpc into 4 ohms) draws about 45 watts with no signal, and, when driving speakers, has an efficiency (Output power/AC power) around 80 percent. Other digital amps would be similar.

75Wpc monos will produce the heat of approximately 180W each on the standby and near 450W each during loud play.
Multiply it by two and you'll get a pretty efficient heater to heat 150 sqfeet room during the beginning of Feb.
Sometimes if I don't have enough heat in my room I can turn on the amps and add some extra watts of heat and be OK.
That's why I bought SS amp that I use either in bi-amp or just single one during summer. My wife is happy as well.