this term refers to a specific area of the building characterized by an alternative (usually intensified) heat flow. It simply helps the heat escape the building. They are linked with insulation issues and are especially bitter for people living in colder regions, such as the UK. The effect they create makes heating and cooling houses greatly insufficient - it takes more energy to keep them warm in winter and cooled during a hot summer. Indirectly, it affects the energy bill and increases the energy intake - harmful not only for your pocket but the Earth in general as well.
