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I would suggest DIY looking for the problem. A tech that even wants to look for it won't be cheap. But if you call up a company and tell them that you have a run or 2 that's not connected somewhere, but the hvac otherwise works fine, they will send someone who can deal with it.
Either way it'll require opening the drywall. Without a snake like user suggested, you'll be making several holes in the drywall. (might be cheaper than the snake rental depending on your DIY abilities.) Personally, I would cut open the ceiling.
Either way it'll require opening the drywall. Without a snake like user suggested, you'll be making several holes in the drywall. (might be cheaper than the snake rental depending on your DIY abilities.) Personally, I would cut open the ceiling.
