| In a study of 60 new buildings, conducted by the Lawrence Berkeley National Laboratory (LBNL) 
50% suffered controls problems40% suffered HVAC problems15% had missing equipment25% of the economizers and VFDs didn’t function as designed Imagine if this study were conducted for existing buildings. They would certainly be in worse shape due to aging HVAC systems and modifications to the building structure. Source: eta.lbl.gov |