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If you change out the refrigerant at the beginning of the summer season, you should be good through fall!!
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Whether you are using R12, R134a or whatever, if you have a leak you have a leak and the leakage rate does not usually stay static. Leakage rates are related to pressure and time, so
the more you use it the more you lose it.
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How's the ES12 Holding Up these days?
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You can still buy the stuff.
However it is still not on the EPA's approved or disapproved list (SNAP) of alternative refrigerants, and probably will never be if the manufacturer continues to market the product as they have (simply rationalize that it does not have to be submitted to the EPA for review as it does not need to be; can you say "loophole"). But at least the manufacturer is forthcoming (finally) about the basis for the concerns, as quoted from the mfg's website:
Enviro-Safe Refrigerant may be used to replace HFC 134a and R12 substitutes in the majority of states within the United States. Enviro-Safe advises that you refer to your local, state and federal laws governing the sale and use of any refrigerant.
If their marketing was really up to par they would publish a list of the states; imagine buying the stuff and installing, and then finding out your local governing body says "no".
At least the manufacturer is acknowledging the key concern here, quoted from their site:
Enviro-Safe™ Refrigerant is flammable to an open flame or spark and is rated as a Flammable Gas 2. This means there is a moderate chance of fire or flame. However, flammable products are used every day within the household, business and in automobiles.
I like the last statement. "Hey bartender. Pour me another. I have a long drive home".
Yeah. I can see us all pumping in some more flammables, especially in cars that date back 30 years, having refrigerant hoses that leak, hoses running adjacent to fan motors that have been known to fry on their own or alongside of high voltage plug wires or in engine compartments with aged wiring.
"YOW. BARTENDER, WHERE'S MY DRINK?"
"Here you go Sonny. Enjoy":