the greater the pressure difference, the more airflow. Reduce the size of the hole or driving force and airflow is reduced. Air sealing makes the air barrier as whole as possible. Top Priority—Air Sealing Because of the Stack Effect, pressure differences are greatest at the ceilings and floors of the building. Basements and attics are also the most accessible for air sealing, and finding leaks in the attic should be the first priority. Leaks around windows and doors are common, so they should be inspected for leaks, especially between the garage and the house. Even if the basement is not in the conditioned space, 34 National Oilheat Research Alliance sealing air leaks is helpful, and insulating to below the frost line to keep the heat exchanger, jacket, pipe or duct heat losses in the building is useful. Over 35% of a home’s energy is lost because of air leaks. Older homes with loose construction can lose all the air in the home twice in one hour. Infiltration loss is the energy required to heat up all the cold air Figure 7
NORA Advanced Efficiency
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