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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.

2017 Current Document Cycle

NFRC 2017 documents have been approved by NFRC membership and The Board of Directors for publication.

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.

NFRC Members have free and Instant access to all documents. If you are a member, make sure to log in. If you are not a member, click here to join.

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

11/4/2020 » 11/19/2020
2020 NFRC Certified Simulator Workshop - Virtual, Session 1

12/2/2020 » 12/16/2020
2020 NFRC Certified Simulator Workshop - Virtual, Session 2

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