Watsco is one of the Americas' largest distributors of residential and commercial heating, air conditioning, and refrigeration equipment (HVAC/R), and parts and supplies. The company's some 605 distribution sites span about 40 states, Puerto Rico, Canada, and Mexico. It also exports to Latin America and the Caribbean. Additionally, the company sells a variety of non-equipment products including parts, ductwork, air movement products, insulation, tools, installation supplies, thermostats, and air quality products.. Customers include some 100,000 contractors and dealers who install and replace HVAC equipment. Watsco generates most of its sales in the US.