There was a science article about this phenomenon. But the experts in it utterly refused to name the causes of it. They cautiously say that there are some hypotheses but it’s too early to state something definite. But the crazy activists already know all about it. Once more time trying to find this article I talked about. Here, on BBC. The experts refused to name the Build this wall church and state shirt causes of the phenomenon. Maybe they have been wary because of reputation risks? As to not using CFC products ask your technician about what coolant use your air conditioner. I’m sure you’ll know smth new for you. And don’t forget that various cooling.