U.S. Department of Energy Energy Efficiency & Renewable Energy U.S. Department of Energy Energy Efficiency & Renewable Energy


Use the glossary to access terms and definitions related to residential energy efficiency programs. Click the letters below to find your terms. Letters that do not appear currently do not have glossary terms related to them.

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Market Evaluation

An evaluation of the change in the structure or functioning of a market, or the behavior of participants in a market, that results from one or more program efforts. Typically, the resultant market or behavior change leads to an increase in the adoption of energy efficient products, services, or practices.

Market Transformation

The strategic process of intervening in a market to create lasting change in market behavior by removing identified barriers or exploiting opportunities to accelerate the adoption of cost-effective energy efficiency as a matter of standard practice.


See “Energy Modeling.”

Multifamily Unit

An individual dwelling unit within a multifamily building (e.g. a building with 2 or more attached dwelling units contained within a common structure).