Hauppauge, N.Y. — BOSS Facility Services’ Robert S. Keingstein lost his battle with cancer on June 20, 2020. He was 68 years old. Bob was a true industry professional with a passion and knowledge of the HVAC industry for over 51 years. Bob started his career as an HVAC apprentice for Forman Air Conditioning at the age of 17 and instantly fell in love with the trade. At the age of 23 he started his first HVAC company and never looked back. He became involved with ACCA (Air Conditioning Contractors …