I think you get used to it, well not completely, but i think the human body is an amazing bit o kit. For me i have to say, its not so much the heat, its the humidity combo with heat. i can do dry heat all day long, no worries, chuck some humidity into that, and it feels like someone slaps you in the face with a wet tuna as you open the door to walk outside.. crazy..
went and did a spot of work on the car yesterday, fire system now all plumbed in, bit of work on the switches, and today i gotta mount the door pulls.. and finalize the door cards. pretty easy..