Low heat alternative to FIRSTWATT J2 ?

zuio  I went through this EXACT dilemma recently, my firstwatt f7 in my small non air conditioned bedroom in hawaii was not useable due to heat but it sounded so good.  The amp replacement that made me happy is the Folsom TD7297 diy amp pcb and folsom antipole psu, it's a 15 watt class AB amp.  You can have a builder make it for you, such as Radu at simpletubepleasures.  It makes no heat and sounds as good as my firstwatt, with even more dynamics

Uncola.....was it the fact that the heat became unbearable in the room or the fact you were worried about overheating the amp itself? I just can’t see how an amp can overheat the room with heat. 

No not worried about the amp overheating itself, the room became unbearably hot after a couple hours with the amp on if I had the door closed

OK, I see you are making the distinction between Pass Labs and Nelson Pass's designs which would include First Watt. No problem. The F. W. are definitely a mixed bag of circuit ideas by him.
charles