The HVAC system at Glenwood Junior High School in Princeton, West Virginia is more than 30 years old and was in need of an upgrade. Teachers complained about inadequate heating and cooling in some of the classrooms, and the school board was looking to reduce overall energy use. So the engineer on the project decided to replace the current constant air volume with a variable air volume (VAV) system reusing the existing ductwork. He called in the duct specialists at Air Duct Solutions for their expert advice.