As for leak, If it is a Split Aircon - the answer is "YES" Don't ask me how it happens or how it can be stopped. Good workmanship can, as said before, greatly limit this leakage.x9200 wrote:One more technical question: if the aircon is not used, can the gas still leak out? I am basically asking if there is any shut off valve between the compressor and the piping.
Shut off ? Nope, Don't remember that either. And anyway the outdoor units are not meant to be user serviceable, so I doubt anybody added that in the system.