One aspect of the invention provides a composite refrigeration line set including: at least one selected from the group consisting of: a suction line and a return line. One or more of the suction line and the return line are a composite refrigeration line set tube including: an inner plastic tube; a first adhesive layer positioned about the inner plastic tube; an aluminum layer positioned about the first adhesive layer and coupled to the inner plastic tube via the first adhesive layer; a second adhesive layer positioned about the aluminum layer; and an outer plastic layer positioned about the aluminum layer coupled to the aluminum layer via the second adhesive layer. The inner plastic tube is polyethylene-fiberglass composite. The outer plastic tube is polyethylene-fiberglass composite. The aluminum layer includes an alloy selected from the group consisting of AL 3004-O, AL 3005-O, and AL 3555-O.