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A condensing unit can be perfectly sized, the indoor coil can be spotless, and the charge can be dead-on—yet the whole job still fails because of one weak link: the copper line set . I’ve seen that exact scenario play out in July heat, on rooftop package changeouts, and on supposedly “simple” ductless installs where a bargain mini split line set turned into a leak chase, a vacuum redo, and an unhappy customer by the end of the week. A good hvac line set is not ju