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Can I recharge the R22 refrigerant in my portable air conditioner myself?

I have a Royal Sovereign portable air conditioner model no. ARP 1000ES. It is 3 years old and not cooling as well as it did when it was new. It is off warranty. Is it possible / feasible for me to recharge the R22 refrigerant myself?
David, September 2009
Besides being completely illegal and unless you have the tools i.e. gauge manifold, refrigerant recovery machine, leak detecton equipment and refrigerant, I wouldn't attempt it.

Andrew, September 2009