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Could an expert give an unbiased evaluation of a supposed refrigerant replacement for banned R22 called R22a manufactured by EnviroSafe. It is reported as a propane based product that works better...

I have installed an Intertherm 4 ton heat pump. I can pull a vacuum on the system, but do not know how many pounds of refrigerant the unit requires.How many pounds does a 4 ton unit requier? I tried...