At the right price Radiant Barrier works wonders saving you money on your utility bills. But just the same as anything else the product must be cost effective! It comes down to how well did the company spend training their employees. So the biggest issue is a five letter word called TRUST. Can you trust the words coming out of your contractor/salesman mouths that your going to save the money they are promising! You can find the products which do have the energy efficient star on them. They jus arent goin to work at best in everyaddict and it has to be cost effective!!