Sterling HVAC are available online at Thermometer Central. Sterling HVAC, the most recognized name in the game, has been producing industry leading high efficiency heating products for over 50 years. From traditional Unit Heaters to Rooftop and Indoor Make-Up Air Units, Sterling HVAC has the solution to fit every residential, commercial or industrial application. A division of Mestek, Inc. a family of over 36 specialty HVAC related manufacturers, Sterling HVAC proudly manufactures all of its products in Farmville, North Carolina USA.