Sorry I don't know the answer to the question but this smells a lot like the r-12 change to environmentally friendly 134 that is suddenly now BAD for the environment. Or is it we did it once, hmm about time to do it again and refill our banks accounts
And the price of 134 is doing what r-12 did along with R U RDY 4 IT again ( What I call the "NEW" replacement).
keep in m mind it's not just the cost of the freon but the equipment required by all small business owners.

Watched the same thing in Ca. with the ever changing emissions laws. SBO buys a 50K machine that is useless 5 years later. This is not a political comment but rathe an observation of mine. Pleases delete if deemed to offensive or political