Environmentally Friendly alternatives to Freon

I'm doing some research on environmentally friendly alternatives to Freon. I know that there's a "new freon" which is supposed to be better for the environment, safer, etc. However, I'm wondering what else is out there, the experiences of people who have tried it, etc. For example, by searching the internet, I came upon something called "Enviro-Safe 22a". It's supposed to save electricity, and be better for the environment. Can you help?

They are several different formulations for different applications. For home Air Conditioning use go with go old R22 or R410a. You really do not have many options depending on equipment. For automotive applications there is R12 and R134 refrigerant. Older automobiles will have R12 and newer models will all have R134. You can still buy R12, but it is very expensive. I would recommend converting to the newer R134. Plus if you are in the USA you need to be EPA certified to use pretty much all refrigerants. You will also need to have a refrigerant recovery,recycling and recharging machine in order to remove the old freon. It is illegal to just release into the air. A good model to check out is the Robinair CoolTech 700 for R134. You will also need a freon leak detector and a air conditioning manifold gauge set to check pressures.