I had the full attic package installed with radiant barrier, solar fans, additional insulation, and new vents winter before last. That previous summer I saw my "averaged" electric bill triple at the end of the year. This past year not only did the increased electricity average drop by over a third, but I had zero propane heat bill and zero electricity bill for Feb & March due to the surplus from the savings. Outstanding! Service and installation was excellent and overall I have been surprised and delighted.