Michael Holigan: Most of the energy dollars you spend heating and cooling your home are lost straight up through the roof. But this is one of the easiest and least expensive ways to get more insulation into your home and save some of those dollars. It's an easy 2-man job. One person to feed the insulation into the blower, the other to spray it into the attic. You should consider using recycled cellulose fiber insulation. It's both ecological and user friendly. Usually about 85% recycled clothing, newspaper and other organic materials. And it won't leave you itching and scratching when you're through. In two to five hours for the average home, you can add significant insulation to your new house or replace some of the insulation that's been lost over time in your existing home. It's hard for people to understand that insulation settles over the years so the R factor goes down, or the resistance to heat and cool. So your utility bills go up. A three to four inch layer will add an R value of 11 to your existing insulation and you'll begin saving money on your monthly utility bills right away. The additional insulation will cost your approximately $200 for an 1800 square foot house. And the savings on your utility bill should pay that cost back over the next one to two years.