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Although I am not an A/C "professional", I do have quite a bit of mobile A/C experience. I have a local shop that I work with to do the leak checking, vacuuming, and charging on the systems I install. I can't say what other shops in my area use for leak checking, but I can say what my local shop uses and does not use. They/I use nitrogen and soapy water for checking before vac and charge, and UV light and a sniffer for afterward. They do not ever rely on a vacuum for leak checking. As far as I know, they do not have any R22 in the shop (does that give them an A- instead of an A since they don't use R22?). Very rarely do they miss a leak with the nitrogen, but when they do, they immediately recover the refrigerant and fix the leak. They employ the latest equipment for A/C work, as well as special schooling when needed (Chris the main guy). I believe their work to be top quality, and I have learned a lot working with them. I think they have done upwards of 20 vac/charges for me on my Sanden retrofits, and I am sure they will do many more......Rich
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