Old dirty, ineffective and unsanitary insulation.

The Building Performance Institute-BPI states that addressing your attention to your whole house envelope is the smartest approach a home owner can take. Seal the complete perimeter and stopping air and heat leaks both coming in or out of your envelope will drastically reduce the amount of heat and gas consumed, your equipment will last longer due to running less and by keeping your heat and cool air you have already paid for inside your “house envelope” substantially saves money and creates a more stable and comfortable living environment.