How do I improve my home's insulation?

Start with the attic, where heat loss is greatest. Add blown-in cellulose or fiberglass batts to achieve R-49 or higher. Insulate basement walls and crawl spaces, especially rim joists where significant heat loss occurs. Check wall insulation if you have an older home with uninsulated walls. Duct insulation in unconditioned spaces also helps. A professional insulation contractor can assess your current levels and recommend the best approach.