According to the US Department of Energy, the average HVAC duct system is approximately 60 percent efficient. An underperforming ductwork system can lead to many problems including increased energy costs, hot and cold spots throughout the house, unnecessary...

HVAC is an abbreviation for heating, ventilation, and air-conditioning. It is an integrated system carrying out all of the above mentioned functions and more often than not, designed to be controllable through a single interface. Modern HVAC systems...