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Lets see here,it is around 0*F here in L.I.N.Y. and I'm headed out the door to work on an OUTDOOR R22 cond unit,medium temp case.Sitting here in my office, I'm going to take a S.W.A.G. at what the head pressure will be . So, what do u all think it SHOULD be? Come on now, be honest! I've told all of my workers that "I don't know" is an honest answer.I say "I don't know" many times a day, everyday.