THERMO-Reflects duct insulation products make duct systems more energy efficient by 10-30%. This increases the overall comfort of a residence and results in significant savings to the homeowner. When installed correctly, these THERMO-REFLECT products can add an R-6 to the insulation value of a duct system. With the recent concerns about fiberglass, now is the ideal time for many contractors to make the switch to THERMO-REFLECT products.