I replaced the AC system in my truck yesterday. Took about 6 hours, would have been 5 if I'd had a stud puller. I took it to my mechanic yesterday afternoon and we pulled a vacuum on it, held it for a bit (no leaks!) and recharged. Setting the climate control to 60° with the fan going full, the air coming out of the vents is a nipple hardening 34°...it's so nice to actually be comfortable in the tuck again.