Here we have to watch out for some of the top-ups guys have done using that junk from the store. Because the retail sale of refrigerant in canisters under 22lbs is prohibited the stuff you buy at walmart is hydrocarbon based, usually propane/butane or something similar, which does work as a refridgerant in systems designed for it (not automotive).
Canada has, I think, R15, they don't sell 134A, read that somewhere. Maybe one can bring down some when coming to Carlisle.
We use R134A here. R12 is extinct. Legislation in place to phase down production limits of R134A to something like .5% of current levels by 2020 and replace it with R1234YF which is apparently what new vehicles are coming with. Right now R134A is a few bucks a pound but the R1234YF is in short supply and going for 50-75 a pound. Soon the R134A will start jumping up in price. We're not allowed to import the small cans of R134A either, yet nothing stops me from diving across the border and doing it on US soil.
