Ah. the misinformation flies around here. A lot of this discussion is correct, but there are a few misconceptions here.
First, it is partly correct that you need a "license" to buy R-12. What you need is an EPA certificate. This amounts to attending a class and taking a test. Passing grade on the test gets you an EPA certificate. This certificate is required to legally buy R-12.
Second, price. Depends on where you get it. It is still somewhat available to buy until supplies are exhausted. New production in this country stopped a long time ago. Price includes heavy taxes imposed by the EPA to discourage use of R-12. Price depends on things like age of inventory, locality, etc. Private sales are largely unregulated.
Third, use of R-12 is NOT restricted to systems that "need to be kept original" so to speak. Any system designed for R-12 CAN use it legally. Most times, availability and price determine whether to convert to R-134a.
Lastly, my opinion. A semester spent in General Science class will account for the dreaded "hole in the ozone" that is being blamed on R-12. Science indicates otherwise. Also, a ten minute look at the periodic table of elements and some basic chemistry seems to counter the idea that heavier than air compounds like R-12 are damaging the atmosphere 8 miles high. Everything I learned tells me that the heavier compounds sink - not rise to the top. And, the REAL reason for the phasing out of R-12 in my opinion is the expiration of DuPont's patents. Follow the money.
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