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Originally Posted by DoGMaN
Using R290 is probably not your best bet, unless you have some HVAC supervision. It is fairly dangerous in the wrong hands. Your best best is to try and build the unit your self, and have an HVAC qualified tech check and fill it for you.
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Thanks. How expensive do you think it would be to build the system from an old freezer and if I use an old freezer can I just leave the refrigerant in there?