Linesets Inc. is the industry leader in insulated copper tube (line sets) - We offer more options and variable lengths than a ... ny other. We specialize in custom lengths, VRF and mini split line sets. Our Climate Components brand of products includes Chem Chill HVAC chemicals and cleaners, Halstead Copper Tube, Copper Fittings & Insulation, plus many other accessories from filter dryers and ball valves, to line set ducting and condensate pumps, to thermostat and control wire, duct and foil tapes, gas valves and connectors. read more