I have a $60 Harbor Freight 8 gal air compressor. I just did inflation or several items, the tank running up to its' operating 150 psi. When done I need to bleed the tank completely so it doesn't rust from the condensation. It's 80* out and after the bleed, on the driveway beside the usual small puddle of liquid, a small spire of ice formed over an inch high (melted immediately). I understand the principle of a blanket covered canteen getting wet to cool it through evaporation but I missed something in Science class evidently. I'm sure somebody here knows exactly what's happening (I'd brush it off if'n it was below 32*F out). Joe