In this mission of technical support specialized in optimization and management of the positive/negative cold of professional premises, we carry out a check-up of the refrigeration installations of SMEs (horeca, nursing home, workshops, supermarkets, grocery stores, etc.). Technical assistance begins with a site visit to identify technical installations, identify bad and good practices, and give some advice to the operator on site. Our advice is then formalized in a report containing the regulations in force, ways of optimizing the operation of the installations as well as calculations of the return on investment time.