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Hi, long time reader of this blog, first post here. I had an ArcoAire A/C unit installed about 5 years ago buy a contractor that I thought was competent. From day one it was a mess and I have fixed several air leak in the duct work (I think I have a great example of what not to do). Now fast forward to my annual service where we found once again it is still leaking freon (it leaked out 4lbs since last year)...I know there is no point to keep adding it. The service company is saying the leak was caused by solder the joints vs brazing (its a 410a system). They say the most cost effective way to resolve this is to replace the unit. My question is, is this true (no leak test has been performed), or is more cost effective to find the leak and replace the damaged parts and redo the line set? I don't want to waste money trying to fix a problem that will result in a shorter life span for the unit. I am located in the Delco PA area.