Worked intensely on the hottest day of the year so far, 110 degrees, hasn't been this hot in 22 years here. Had the beginnings of overheating, I started to get nauseous, felt sick, set everything down and went into the house, nice 74 degrees solved the problem in about 10 minutes, strapped an icepack to myself and filled my pockets with ice, poured cold water over myself and went back out there, was okay like that for a few more hours, took another 10, more water, the it was a few degrees cooler and no problem after that. So the issue was the sun. Since I can't destroy the sun, I ordered a movable canopy to erect tomorrow, since I'll be continuing tomorrow but in the shade this time.