Could need 1lb or could need 10lbs, its hard to guess. The only way to know for sure is to recover whats left, weigh it then calculate how much it needs per manufactures charge weight plus line set length. I'd advise you to get a second opinion, sounds like you got a sales tech rather than an hvac tech.
Hi Jtrammell, gotta question for you. Why not just weigh the drum before and after you fill up the system? Recovering the whole charge and weighing in a new charge seems like a lot of time and work on a undercharge.
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