A deep energy retrofit is a whole-building analysis and construction process that uses integrative design to achieve much larger energy savings than conventional energy retrofits. Deep energy retrofits can be applied to both residential and non-residential (“commercial”) buildings. A deep energy retrofit typically results in savings of 30 percent or more, perhaps spread over several years, and may significantly improve the building value.
Conventional energy retrofits focus on isolated system upgrades (i.e. lighting and HVAC equipment). These retrofits are generally simple and fast, but they often miss opportunity for saving more energy cost-effectively.
A deep energy retrofit combines energy efficiency measures such as energy efficient equipment, air sealing, moisture management, controlled ventilation, insulation, and solar control so that dramatic energy savings are achieved alongside optimal building performance.
A Level III energy audit, as defined by ASHRAE, is required in order to complete a commercial building deep energy retrofit. Also known as an investment grade audit, this type of energy audit features analysis of the interactions between efficiency strategies and their life cycle cost . Upon selection and implementation of measures, the energy savings are verified using the International Performance Measurement and Verification Protocol.
Deep energy retrofits make use of energy modeling tools such as eQUEST and life cycle cost analysis tools that integrate with an organization’s pro forma or other financial decision making mechanisms.
A building that has undergone a deep energy retrofit is well positioned for a green building rating such as LEED and the building energy efficiency ratings described at BuildingRating.org.
There have been a number of studies done to determine and quantify the benefits afforded to owners, tenants, and various other stakeholders from the successful completion of deep energy retrofits.
The Empire State Building is undergoing a deep energy retrofit process that is projected to be completed in 2013. Upon completion, the project team, consisting of representatives from Johnson Controls, Rocky Mountain Institute, Clinton Climate Initiative, Jones Lang LaSalle, and NYSERDA will have achieved an annual energy use reduction of 38% and $4.4 million.
The City-County Building recently underwent a deep energy retrofit process that is projected to be completed in September 2011. Upon completion, the project team, consisting of representatives from the Indianapolis Marion County Building Authority, Indianapolis Office of Sustainability, Rocky Mountain Institute, and Performance Services will have achieved an annual energy reduction of 46% and $750,000 annual energy savings.
The Byron Rogers office building is an historic high-rise office building located in Denver. Projected to be completed in 2013 with LEED platinum status. Upon completion, the 494,000-square-foot (45,900 m) building will have reduced it’s energy usage by over 60%
A 2011 report by New Buildings Institute for BetterBricks, a Northwest Energy Efficient Alliance initiative, lists 50 commercial building retrofit projects that save at least 30% of the building energy using a whole-systems approach.
