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When you refer to a "copper liner set," you could be talking about several different products, including cookware, plumbing, or components for mini-split HVAC systems. Given the ambiguity of the query, here's a discussion of copper liner sets in different contexts.
For HVAC systems
Copper line sets are used to connect indoor and outdoor units in mini-split air conditioning and heat pump systems.
Pros:
Durability and longevity: Copper is resistant to corrosion and stands up well to the elements.