Rheem is an American-based company that produces heating, cooling, and water heating products. Founded in 1925 by brothers Richard and Donald Rheem, the company has grown to become one of the largest HVAC manufacturers in the world. Rheem products include furnaces, air conditioners, heat pumps, boilers, water heaters, pool heaters, and air purifiers. The company also offers thermostats, humidifiers, and other HVAC system accessories. Rheem is dedicated to providing innovative solutions to improve the comfort, energy efficiency, and sustainability of homes and businesses.