Christian Brothers Mechanical Services, Inc. is a full-service commercial mechanical contractor for heating, ventilation, and air conditioning. Founded in 1985, Christian Brothers remains a family-owned company, committed to delivering superior mechanical and service solutions. With more than 280 employees, we are one of the largest regional HVAC contractors serving Los Angeles, Orange, San Diego, Riverside and San Bernardino counties. From commercial HVAC air conditioning maintenance and HVAC repair, to air purification systems and building automation controls, CBMS provides the finest quality service available.