just a little caveat for the R12 thing... the big ban came up just as the patent came up for renual... amazing co-incidence or what? The new R-12 replacements: HOTSHOT... a mix of R12 and R22... now if R12 is bad, just how the hell can it get better with a mix of 22? Also.. refrigerant is heavier than air.. if you find someone passed out and you suspect refrigerant poisoning, you should turn him upside down so the refrigerant can drain from his lungs
( after evacuating him from the enclosed space of course)..

SO.. if the refrigerant is heavier than air, just how the hell is it being found in the upper atmosphere...

inquiring minds want to know...