Welcome to Atlantic Sydney Plumbing, Heating & Air Conditioning. We hope this site provides you with all the information you need regarding your Sydney Plumbing, heating, & cooling solutions. Sydney Plumbing, Heating and Air Conditioning, Inc.. Founded in 1977, Atlantic has been dedicated to honesty in business, quality of workmanship and customer satisfaction since its inception. Recently, Contractors 2000, a leading national organization in the HVAC industry, recognized Atlantic as the #1 contractor in the nation for customer satisfaction..