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Technical Documents
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Technical Documents

One of NFRC's main functions is to promulgate technical standards that establish uniform procedures for determining the various energy performance ratings: including U-factor, Solar Heat Gain Coefficient (SHGC), Visible Transmittance (VT), and Condensation Resistance.

2014 (Current Document Cycle) - Revised April 2014 

NFRC 2014 documents have been approved by NFRC membership and The Board of Directors for publication. Implementation date for 2014 rating system was April 2014. 

For NFRC Certification of fenestration products, either WINDOW5/THERM5 or WINDOW6/THERM6 may be used for the simulation of those products. However, after July 1, 2011 only WINDOW6/THERM6 will be authorized for NFRC Certification.

By accessing and downloading NFRC documents from this webpage, the user agrees to abide by the terms of use. To request a previous edition of an NFRC document, please complete the form HERE.

Note: Errata or addendums will be noted in the footer of each documents. e.g. [E1A0] would mean that there is one errata published to the original document.

Simulation Manuals


WINDOW6.3/THERM6.3 Version



CPD 2.0

Visit the CPD Info page to download manuals, upload spreadsheets, issue and request forms, and FAQs.

2010 Interpretations

Technical Bulletins



2001/2004 Interpretations (Not Current)


more Calendar

9/25/2017 » 9/27/2017
NFRC 2017 Fall Membership Meeting

10/8/2017 » 10/11/2017
ASTM Committee Week

10/22/2017 » 10/31/2017
ICC Annual Conference and Group C Public Comment Hearings

1/10/2018 » 1/12/2018
International Builders Show

1/10/2018 » 1/12/2018
NAHB International Builders' Show

Online Surveys
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