R12 is illegal unless you have a license. It is illegal to dispense R12 into the air. R12, when in the presence of an open flame creates a toxic gas so nasty that one whiff can kill you(like, if you are smoking a cigarette while it is in the air)
R134a is not illegal without a license. It is illegal to dispense R134a into the atmosphere(but you wouldn't do that, would you?) R134a is available just about anywhere in any quantity and now even has it's own TV commercials. They say even a moron can charge their own A/C system.
However, A/C systems are fairly delicate systems to fool with, and the risk of an overpressurized system exploding is high, especially when the ambient air temp is high. Also, having a lack of formal training with air conditioning systems will lead to people causing more problems than what they can solve, by purchasing a 12 oz can in an autoparts store.
My suggestion is just to take a few minutes and read about automotive air condition systems. Learn all teh parts, their functions, and what they should be doing when functioning properly. The directions on a can are not full proof by any means; and if you will notice, the bottom of the can has a crescent moon stamped impression. This is there because it allows the can to EXPLODE in a controlled fashion. However, it is still an explosion of a pressurized gas in liquid form. As the liquid turns to gas rapidly it causes frostbite and tissue death on anything it touches. So, if you have teh bottom of the can pointed towards yoru face and the compressor kicks off and the can overpressurizes, you will no longer have a nose or eyelids, or eyeballs. You will look goofy!
I'm not trying to scare you, I'm just trying to let you know that you should take a few minutes to understand the system and chances are, with proper safety equipment, you will not loose an eye.
On teh other hand, your mother will then think you are still not happy. I mean, if she is anything like my mother, who swears I will never be happy until someone looses an eye.
On the third hand... I love the fact I can go to a store, buy a can, hook up my gauges, and recharge my A/C especially on a day like today. Having to get a license for the old stuff, and having to take my tractor to the car dealer I worked at, to use their machine, was too much of a hassle.
I'm glad your state has finally approve the consumer sale and use of R134a refridgerant.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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