yeah, wet rags. it worked, but like I said too much hassle and risk.
I do have fans although not as sophisticated as that amp cooler. Anyway I decided that in the summers here I will only run Class D, they have gotten quite good.
In the winter I dust off my A1 and Transcendent T8-LN OTL and switch back and forth between them.
But I don't mind experimenting in the summer with the more efficient electronics. It is interesting and it is a good thing for the planet if we can figure it out.
Plus I very likely will be moving to a South Pacific island in the next year or two so I might as well find some hi-fi components that I like that will be practical in such an environment.