This graphic helps show why having a properly insulated home is key to energy efficiency. Leaks tend to occur in areas of a home where insulation is lacking, which is why having a tighter seal around your home will save you from using and spending more on energy. The arrows throughout the house in this graphic depict the most common places where there is air leakage. Cool air typically leaks through into the basement, and warm air tends to escape through the attic.