Office buildings make up the largest sector of building type within the commercial sector, comprising 17% of all commercial buildings in the U.S, as well as 17% of the energy. There are many efficiency opportunities in both existing office buildings, and new construction. In existing buildings these opportunities include equipment upgrades, improved building and energy management systems, commissioning, and improved operations and maintenance (O&M). For new construction, using advanced design and technologies is an important means for saving energy.
Building benchmarking (e.g. Portfolio Manager) and building labeling (e.g. ENERGY STAR) are two areas that are getting more attention, particularly in the office building sector.