the invention relates to an improved heat recovery system which is intended for air - conditioning and to reduce the cold corridor effect . more specifically , the invention relates to a system for making use of heat that is released during the condensing and / or cooling of a refrigerant fluid , in order subsequently to heat an airflow passing through an open retail refrigeration cabinet or lines of same , using a specially - designed unit for distributing and supplying heated air . the inventive assembly is equipped with a regulation and control device which can be used to maintain acceptable comfort levels for customers in the areas surrounding said open retail refrigeration cabinets or lines of same . the inventive system represents a significant improvement in relation to the design of the previously - patented system .