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We had our R12 replaced by what they call a "drop in". It's a refrigerant designed to go in place of R12 (which is now illegal in UK). You don't have to make any changes to the system like you would for R134a - it doesn't rot the seals.
I'm told the most effective (and cheapest) stuff to put in is R600, which is a fancy name for plain old camping-stove Butane. I couldn't find any local a/c engineers willing to do it - although I believe it's common practice in some European countries.
Phil.
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