Sustainable Engineering – Delivering Better Buildings

Knowing your building’s energy efficiency

How does your building’s energy usage compare to the energy usage of the average commercial building? It could be that one of these is wasting your energy; and it’s possible one or more of the approaches listed will make your building well above average.

Top: Average Energy Usage Annually by Commercial Building Type.

Below: Energy Use by System, Average Commercial Building.

[U.S. Energy Information Administration]

Average % of total energy saved by retrofit measures,
average commercial building in the US. [GARD Analytic]


Energy wastes most commonly found
during audits and retro-commissioning in
typical commercial buildings. [ASHRAE]