Since 1993 Allison Mechanical, Inc. has steadily grown to become one of Southern California’s premiere HVAC contractors and is recognized on the national level by achieving the United Association S.T.A.R. company certification and the United Association Green S.T.A.R. company certification. Specializing in the fields of air conditioning, refrigeration, heating, ventilation, and energy management, our highly qualified technicians provide our customers with over 300 cumulative years of service, maintenance, installation and retrofit design experience.