Weatherization is one of the most efficient affordable housing tools available to communities and residents. Weatherization is defined as the practice of protecting a building from the elements (such as sunlight, precipitation and wind) and modifying the building to reduce energy consumption and maximize energy efficiency. Traditionally, weatherization processes have focused on heating and cooling as methods to conserve energy. Currently, however, weatherization is expanding and beginning to focus on “whole house” approaches to incorporate advanced technology. The new methods address energy usage in a comprehensive manner, with a focus not only on heating and cooling, but on environmental impact, health and safety, and economic benefits. Weatherization technologies are evolving from traditional methods in an effort to provide greater energy savings for consumers and to contribute to the economic and environmental health of communities.