Bruce Greenstein's award for 25 years of membership in the Refrigeration Service Engineers Society (RSES.) Matthew Greenstein's award for Introductory Technician Ice Machine Training. U.S. Mechanical's award for joining Mitsubishi Electric's Diamond Contractor Program. U.S. Mechanical has been providing our HVAC-R service for more than 30 years. We are a full service mechanical contracting company. Our mechanics handle all brands of air conditioning, heating, refrigeration, & ventilation equipment.