Linesets, Inc. is the premier line set manufacturer in the U.S.A. and offers the shortest lead times in the industry. There are four strategically located manufacturing facilities in the U.S. and we offer the most options in terms of custom lengths, insulation types and sizes than any other U.S. manufacturer. Hard and Soft Pre Insulated Straight Lengths- Up to 20' in length available. All U.S.A. made. In recent years, Linesets, Inc. has added Climate Components to their offering with a variety of products ranging from HALSTEAD copper tube, SOUTHWIRE thermostat wire, mini-split control wire, and EZ-IN mini-split cable, Titan ER, and elastomeric rubber.