What is the best insulation with the best payback time?

The best insulation for payback time often depends on the specific application and local climate, but spray foam insulation typically offers Excellent thermal performance and air sealing capabilities, leading to significant energy savings. Its high R-value per inch and ability to expand make it effective for reducing heat loss and improving energy efficiency. While its initial cost can be higher than other options, the long-term savings on energy bills often result in a favorable payback period. Additionally, cellulose and fiberglass batts can also provide good payback times in many situations, particularly in attics and walls.