maybe this will help. You can buy these refrigerants in small quantities Im not sure its legal
but ebay has them and many online stores are selling them never asked me for my license
. If your cruising long distance it would be worth carrying a can large enough to recharge your system. The small cans r134a seems to be more readily available so a refer with 134a would be a plus. r-12 from what I have heard and suggested on this sight is most effecient. R410 has done really well and Im pleased with the way its performed so going forward that may be an option to look for. This thread got totally hijacked but the information has been good. The laws are really intended for big units mine has I think after being corrected .9 kg of freon. Many of the roof top units you see have 80lbs and more of freon. At this level you should be okay with any freon. Putting in more freon when there has been a loss does nothing. It is common that this seems like a repair. The freon can't leave unless there is a leak. Im always impressed with the depth
this forum brings to any subject. Im alicensed hvac
tech but wasn't sure of some of the restraints. Also as a side it is not my livelyhood so Im not as informed as many here. I was licensed as not being so was an obstacle in being self sufficient.