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Changing Refrigerant in Central Air from r22 to M099

My plumber has been trying to sell me a whole new HVACstating that r22 has become to expensive and hard to get. But after a little research I found a supposed replacement refrigerant

DuPont

Isceon MO99

Looks like 25 lbs will run about $220.00 + $39.00 shipping on Amazon.

Then all you do is recover the r22 from the current system, check the seals and replace the gas. The law says this must be done by a licensed professional and that is fine. He then has a lot of r22 he can sell to someone else.

I also know that if I know what the problem is and the solution, I protect myself from service professionals that may want to sell you something you don’t really need.

My immediate question is how do I find out or calculate just how much gas my system needs?

@ladytech @oldturkey03 do you know anything about this. It could be a very important answer for lots of homes and a whole lot of $?

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R22 is obsolete and reason your hvac technician recommended you to replace whole unit is probably leak on your unit and loss of that refrigerant. Cost of Mo99 is not small + cost of using proper recovery equipement, leak detection and if its possible to seal system overcomes price of new air conditioner. Even if you recover some R22 from your old system, it is not legal to resell it, has to be recycled, also costly!

Every Air Conditioner have nameplate with type and quantity of refrigerant in it.

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mayer さん、ありがとうございました!
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