A lot of air is lost into the attic through the attic fan in homes. The attic fan was removed and replaced with drywall and sealed. The attic had its exhaust fans just going to the attic so the exhaust was never leaving home. Dr. Energy Saver put in vents and connected the fans to them to properly get the exhaust out of the home. Insulation was then blown into the attic to give a thermal barrier inbetween the attic and the upstairs. Now this Troy,IL home has very comfortable upstairs.