There are three ways to retrofit a commercial building to be energy efficient:
Upgrading the building “envelope,” or exterior parts of the building to regulate interior temperatures. This includes windows, doors, insulation and roofs.
Upgrading equipment, including overall HVAC, boilers/chillers, cooling towers and lighting.
Operational efficiency through integration of technology that allows you to analyze the buildings overall energy usage with real-time information. Sensors, smart meters and controls provide data-driven managing of buildings, with less monitoring and maintenance needed as a result.