Been in operation since 1873, Adema Heating & Air Conditioning is a provider of sales, service and installation of residential and commercial heating, air conditioning and ventilation (HVAC) systems. The firm has expertise in servicing and installation of residential and commercial heating, air conditioning and ventilation (HVAC) systems in Western New York. Based in Buffalo, N.Y., it specializes in selling, installing and servicing of a number of products, such as furnaces, central air conditioning, water and steam boilers and dehumidifiers.