Revision History

This page summarizes significant revisions to the published book. Minor editorial corrections, formatting changes, and internal development changes may not be individually listed.

August 18, 2026

Initial Public Edition

• Completed Modules 1 through 11 covering EPA Section 608 Core, Type I, Type II, Type III, Universal review, and reference materials.
• Verified current regulatory content against applicable EPA and eCFR sources.
• Added current and historical refrigerant-regulation comparisons.
• Added comprehensive practice questions, mock examinations, quick-reference materials, and instructor resources.
• Added common refrigerant quick-reference and pressure-temperature tables.
• Added Credits and Acknowledgments, Disclaimer, and License pages.
• Published the first mdBook web edition through OpenEngineeringBooks.org.