Tony Botkin of Intelligent Energy Solutions (IES) performed a blower door test and indentified areas of air leakage in the attic and other places. There were various holes or openings at the top of the walls that allowed cold air to leak into the walls behind and in front of the wall insulation bats. This allowed cold air to move down the wall cavities in front of the insulation and make the room colder. IES also found leaks such as a conduit from an outside light to its switch box inside of the house.