Thanks for asking the question, HBing! I wonder if humidity also has an effect? It isn't just hot here, it's really humid, which is probably more of a problem for me than the bees. When I did a check on Sunday, it was late in the day, 5 p.m., and I clearly saw new comb stretching, so decided to back off the full inspection. My hive is also in the shade (of the dappled variety). I have a bottom and top entrance -- when I hang out and watch them in the evening, I'll put my hand up to the top entrance (no foragers ever use it as an exit -- just bees hanging out) and there is a noticeably cool breeze coming out of the hive! At first I thought I was imagining things, but no, they have their own ventilation system going nicely.