Here's more information about the three main codes organizations whose work impacts the HVACR industry:

IAPMO (International Association of Plumbing and Mechanical Officials): serves in the protection of the public’s health and safety through the development and maintenance of the Uniform Mechanical Code (UMC) and the Uniform Plumbing Code (UPC).

ICC (International Code Council): serves to provide the highest quality codes, standards, products, and services for all concerned with the safety and performance of the built environment. ICC founders include Building Officials and Code Administrators International, Inc. (BOCA), International Conference of Building Officials (ICBO), and Southern Building Code Congress International, Inc. (SBCCI).

NFPA (National Fire Protection Association): serves to reduce the worldwide burden of fire and other hazards on the quality of life through providing and advocating scientifically-based consensus codes and standards.