Abstract: Low ambient temperature air source heat pump (water chilling) package is mainly used for heating in northern China and cold winter. It is the main product of clean heating policy issued by the state in recent years. The main differences between the new edition and the previous one of GB / T 25127-2020 "Low ambient temperature air source heat pump (water chilling) package" series of national standards are described. The new edition of the standards have modified and supplemented some contents concerned by the industry. The main change is that the comprehensive performance coefficient is adjusted from IPLV to APF.

Key words: Low ambient temperature air source heat pump (water chilling) packages, Standard, Performance testing, Policy basis