ANSI/ASHRAE Standard 37 provides test methods and calculations for steady-state, cyclic, and part-load performance and methods for establishing seasonal performance for unitary air-conditioning and heat pump equipment, including single capacity, multiple capacity, variable capacity, unloading, or multiple compressors for ducted and ductless systems.

The 2024 edition of Standard 37 comprises a major revision of Standard 37-2009 (RA 2019). Applicable sections of ANSI/ASHRAE Standard 116 have been added to provide an inclusive testing and rating method.