Mann Mechanical Company, Inc. is a mechanical contracting firm established in 1969 in DeKalb County, Georgia. Corporate executive offices are located on 100 Pine Street in Avondale Estates, Georgia. We are licensed to do business in Georgia, Alabama, and North Carolina. HVAC and plumbing services for all types of facilities Process piping Equipment placement Institutional work, including medical gas systems Project experience includes Research and development facilities Industrial process work All phases of hospital construction and renovation Office buildings and data processing Central plants Institutional and mission critical facilities throughout the Southeast