Operational since 1974, Wales-Darby is a provider of mechanical systems to its customers in residential and commercial markets. Located in Islandia, N.Y. it represents manufacturers that provide solutions to the HVAC (heating, ventilating and air conditioning) and plumbing industries. The company offers customers a wide range of products, such as diaphragm expansion tanks, thermostats, high capacity heaters, iron filters, rainwater reclamation systems, etc. It represents various brands, including A.O. Smith, Flexcon, Fujitsu and Taco. Wales-Darby has affiliations with various organizations, such as Air Conditioning Contractors of America and Green Mechanical Council.