[Blood of Tyrants]

Years ago I read that the push to replace R22 was by Dupont because their patent was expiring.

[Raycpa]

Neat coincidence.

[Don Corleone]

Years ago I read that the push to replace R22 was by Dupont because their patent was expiring.

You were correct.

[jaydubya2]

I read an article a few years ago that said there was an error in the calculation on the environmental effects study of r-22. That error resulted in R-22 appearing 10 times worse for the environment that it actually is.

[IYAS9YAS]

Years ago I read that the push to replace R22 was by Dupont because their patent was expiring.

R-12 for cars was replaced by R-134a, and that was the rumor 20 years ago, back in the early 1990s. I worked at Autozone at the time, and the switchover meant that one day we could sell Average Joe a can of R-12, and the next we could not. We could still sell it, but only to licensed A/C techs/shops. The only thing we could sell to everyone was R-134a.

Not sure about the R-22 issue with respect to household systems. Probably the same deal.