NoSpam,

R-22 IS NOT amonia. R-12 is NOT outlawed, just not allowed to make any
new R-12 in the USA. You can still buy R-12, about $25 to $30 per
pound, including tax. If you buy reclaimed refrigerant, R-12 is
cheaper. R-22 is still being made and equipment using it is still
being made. R-410a is at least 3 times more expensive at wholesale
level than R-22, but is slowly coming down in price.

Stretch