Gents.
In this neck of the woods alot of companies have started to advertise that to save energy they are having specials on "change out of gas" thats the advert. pitch what they are trying to convince persons of is, if persons with a/c units wise to save a bundle of cash on their energy bills,the should pay to have their refrigerant gas changed to one of the newer blends.e.g(r22 to 404a)
How much of an energy saving will be seen or can be seen by just a gas change any takers