The article discusses a study that aimed to create a computer tool to accurately measure how much energy is used by heating, ventilation, and air conditioning (HVAC) systems in buildings. The researchers focused on specific HVAC equipment like air intake and heating and cooling coils. They tested the tool on an office building to see how well it worked. The study suggests that future research will expand the tool to include more components and calculate the total energy used by the entire HVAC system.