PermaLoft may be the only loose fill, blown-in wool insulation in the world. Made from sheep’s wool, the product reduces heating and cooling costs by eliminating voids and air pockets. Plus, because it does not contain fibers that itch, installers aren’t required to wear protective clothing. Cost: $2.95 per pound.Oregon Shepherd. 888-629-9665. www.oregonshepherd.com.