Ever hear of air conditioning. ? I have no idea of what speakers you are driving, much less your taste in music, but getting rid of PRIMA LUNA, well, I think you will discover is a big mistake, just for the sake of an environmental condition.
Considering that PRIMA LUNA designs employ technology that only drives the power output stages at about 30 - 40% of their full capacity is also puzzling. Were you to switch to a very good quality "CLASS A" solid state amp, you will soon find that it too, will dissipate a significant amount of heat. So, if the temperature of your room is more important that the quality of you audio reproduction, then perhaps you should go "CLASS D". (YUCK !! )
PS If you are stuck using a noisy window AC unit., Then I might suggest a portable MITSUIBISHI "heat pump" which both cools and heats. I've read good reports on it.