Thanks for the advice regarding the different options. It appears that I will have to upgrade to R134A since Canada's regulations are a bit different compared to the US. Hopefully, the system will cool better than now. Since summer is not as intense up here, I'm hoping that an R134A conversion brings good performance. There is one product that is sold legally here under the name Red Tek 12A that is supposed to work as well as R12. Has anyone heard of it?