So were having a bit of a heat wave here in the SF Bay Area this week. Last night after work, I settled in to a listening session with my MJ2. No A/C in the condo and like 90 degrees in the room. After about one album, I had to turn it off. This thing sure generates some heat. This is not really a criticism, it's worth it. And it will actually be welcomed in the winter. Between my big LCD computer monitor, which also generates a fair amount of heat, and the MJ2, I may not even have to use a heater in the room in the winter.