Minnesota has actually recorded the highest dewpoints anywhere in the world. We get very humid summers, with highs in the upper 90s and low 100s (usually in July). The smallest window air conditioner I could find will easily keep up with our S-30 in my living room- its class A and 30 watts per channel.
But- I would be looking into a class AB tube amplifier before I went with transistors! A class A transistor amp is going to make nearly the same heat as a class A tube amp- the filaments are a minor concern. IOW most of the heat comes from the class of operation. So a class AB tube amp will make **less** heat than a class A transistor amp will, assuming that they are about the same power.
But- I would be looking into a class AB tube amplifier before I went with transistors! A class A transistor amp is going to make nearly the same heat as a class A tube amp- the filaments are a minor concern. IOW most of the heat comes from the class of operation. So a class AB tube amp will make **less** heat than a class A transistor amp will, assuming that they are about the same power.