Version 2.5 is a transitional specification in which homes must follow the Version 3 requirements, with some exceptions.
Additionally, homes that are eligible for qualification under Version 2 can, at the builder’s discretion, earn the label under Version 2.5. For more information about the transition from Version 2 to Version 3 guidelines, see the Transition Timeline.
There are two paths to qualify a home to earn the ENERGY STAR. The Prescriptive Path is based on a predefined package of improvements, while the Performance Path is based on a customized package of upgrades. The National Program Requirements define the core energy efficiency specifications for both the Prescriptive and Performance Paths. Version 2.5 is same as Version 3 except for several changes that will help partners successfully transition from the Version 2 to 3 guidelines. The National Program Requirements for Version 2.5 modify and should be read along with the National Program Requirements for Version 3.
Both the Performance and Prescriptive Paths require completion of four inspection checklists:
These checklists include building science practices that promote improved comfort, indoor air quality, and durability in certified homes. The Inspection Checklists document contains the four checklists that every home certified under Version 3 must complete. See the Inspection Checklists (869KB) (Revision 06).
While the inspection checklists must be completed under Version 2.5, certain allowances are made that will help partners successfully transition from the Version 2 to 3 guidelines. To see these allowances, see the National Program Requirements for Version 2.5 (100KB)(Revision 05).
EPA has developed guidebooks for these inspection checklists to explain the rationale behind each item.
‘Sampling’ allows builders who have demonstrated an ability to consistently meet the ENERGY STAR guidelines to minimize production interruptions and verification costs. For more information, see Chapter 6 of the Mortgage Industry National Home Energy Rating Standards.
Because the Version 2.5 guidelines are the same as the Version 3 guidelines with the allowances and exceptions noted in the National Program Requirements for Version 2.5, changes to the Version 3 guidelines affect Version 2.5.
EPA periodically makes policy changes and clarifications, typically in response to a unique situation within a particular climate zone, and shares frequently–asked questions. See Recent Policy Changes and Clarifications.
County–level ENERGY STAR Reference Design documents and regional specifications have been developed for states with advanced codes or unique climate considerations. See Regional Specifications.
EPA has developed separate verification guidance for Modular and Manufactured homes. Learn More
EPA has archived documents related to the development of the Version 3 guidelines, including the draft specifications, public comments, and EPA responses. View the Archives.