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This report describes solutions to the common PRM adoption challenges, including calculating energy savings by fuel type and electricity demand savings relative to current code and avoiding “fuel switching” when reporting savings of the proposed design relative to the current code. The calculations described in this technical support document are automated in the ASHRAE Standard 90.1 Performance Based Compliance Form and the Compliance Form Companion Tool

This technical support document (TSD) is designed to explain the technical basis for the COMcheck software as originally developed based on the ANSI/ASHRAE/IES Standard 90.1-1989 (Standard 90.1-1989). Documentation for other national model codes and standards and specific state energy codes supported in COMcheck has been added to this report as appendices. These appendices are intended to provide technical documentation for features specific to the supported codes and for any changes made for state-specific codes that differ from the standard features that support compliance with the national model codes and standards. Beginning with COMcheck version 3.8.0, support for 90.1-1989, 90.1-1999, and the 1998 IECC and version 3.9.0 support for 2000 and 2001 IECC are no longer included, but those sections remain in this document for reference purposes.

To meet states where they are and better understand specific needs and priorities related to building energy codes, BECP is expanding proactive, individualized engagement with states and local jurisdictions. BECP continues to offer a robust and ever-evolving collection of information and technical assistance resources available online to help all states, territories, jurisdictions, and tribes save energy and improve their buildings.

Facilitated by Pacific Northwest National Lab (PNNL), in coordination with the six Regional Energy Efficiency Organizations (REEOs) and additional technical assistance providers, the Network will utilize regional code professionals, building science experts, and experienced trainers to customize technical assistance to states and jurisdictions.

Facilitated by Pacific Northwest National Lab (PNNL), in coordination with the six Regional Energy Efficiency Organizations (REEOs) and additional technical assistance providers, the Network will utilize regional code professionals, building science experts, and experienced trainers to customize technical assistance to states and jurisdictions.

The primary method for creating a population of homes from which to derive a random sample, as explained in the methodology, is to contact sample jurisdictions to obtain lists of homes. These lists are then sorted randomly to fulfill the sample. While this method has had success, it is not always possible to obtain a list of permits from a jurisdiction. In addition, even when permit data is available directly through a jurisdiction, it can be difficult to ascertain information on the construction status of sample homes. Knowing the phase of construction can be used to inform the timing of site visits to improve data collection efficiency.

For these reasons, alternative or supplemental methods of creating a home population for random sampling may be necessary. Alternative methods that may be used to build a list of recently permitted homes include target searches using jurisdictional inspection schedules, online real estate services, and general internet searches. The same alternative sources of data used to generate the population of homes may also help in scheduling site visits to arrive during phases of construction that maximize the number of observations per site visit.

Expected savings overview of new homes built to the 2021 IECC and new commercial buildings built to ASHRAE Standard 90.1-2019 by State.

Expected savings overview of new homes built to the 2021 IECC and new commercial buildings built to ASHRAE Standard 90.1-2019 by State.

Expected savings overview of new homes built to the 2021 IECC and new commercial buildings built to ASHRAE Standard 90.1-2019 by State.

Expected savings overview of new homes built to the 2021 IECC and new commercial buildings built to ASHRAE Standard 90.1-2019 by State.

Expected savings overview of new homes built to the 2021 IECC and new commercial buildings built to ASHRAE Standard 90.1-2019 by State.

Expected savings overview of new homes built to the 2021 IECC and new commercial buildings built to ASHRAE Standard 90.1-2019 by State.

Expected savings overview of new homes built to the 2021 IECC and new commercial buildings built to ASHRAE Standard 90.1-2019 by State.

Expected savings overview of new homes built to the 2021 IECC and new commercial buildings built to ASHRAE Standard 90.1-2019 by State.

Expected savings overview of new homes built to the 2021 IECC and new commercial buildings built to ASHRAE Standard 90.1-2019 by State.

Expected savings overview of new homes built to the 2021 IECC and new commercial buildings built to ASHRAE Standard 90.1-2019 by State.

Expected savings overview of new homes built to the 2021 IECC and new commercial buildings built to ASHRAE Standard 90.1-2019 by State.

Expected savings overview of new homes built to the 2021 IECC and new commercial buildings built to ASHRAE Standard 90.1-2019 by State.

Expected savings overview of new homes built to the 2021 IECC and new commercial buildings built to ASHRAE Standard 90.1-2019 by State.

Expected savings overview of new homes built to the 2021 IECC and new commercial buildings built to ASHRAE Standard 90.1-2019 by State.

Expected savings overview of new homes built to the 2021 IECC and new commercial buildings built to ASHRAE Standard 90.1-2019 by State.

Expected savings overview of new homes built to the 2021 IECC and new commercial buildings built to ASHRAE Standard 90.1-2019 by State.