National Refrigeration was founded in 1969 by Jack King, Sr. as a one man HVAC shop in Warwick, R.I. Over the last 47 years N ... ational has grown to over 100 employees and remains family owned. We serve all of Rhode Island and make it easy for customers to get heating and air conditioning problems taken care of on-time and on budget. National provides a full slate of HVAC mechanical contracting and plumbing related services for clients in the commercial, residential, multi-family residential and service markets. We always strive to bring our clients the best solutions possible utilizing our experience, local presence, cost competitiveness, financial strength and a relentless attention to detail. National specializes in heating, cooling, indoor air quality and plumbing for commercial properties. Everyone at National Refrigeration works together as a team towards a common goal... Ensuring our clients comfort. Every Day. read more