With temperatures in the northeast (US) also starting to climb a bit now that spring is upon us, I have noticed my folders getting warmer as well. The only one that worries me is my OC-ed 1090T box. Fall and winter, I saw CPU and GPU temps in the low 50s (C), but this month, I've noticed them running 57-59C. I may need to back off the OC and turn down the GPU % usage soon as well. I'll see how it goes. I haven't turned the house AC on yet, but generally we have that set around 75, so it wouldn't have turned on yet anyway.
Regardless, 15-20% less output from me is probably not nearly as noticeable, as say 15-20% from you heavyweights who posted here before me. Your potential loss in output probably exceeds my TOTAL output by a magnitude of 10 or so.