Columbia Commercial Rooftop HVAC Systems Midland Air Service Experts Heating & Air Conditioning in Columbia gives you choice in commercial rooftop HVAC products and services. For example, Lennox® packaged rooftop commercial HVAC systems are top the list of the most innovative products you can find today, including the new solar powered SunSource® System for Energence® rooftop HVAC systems. By combining industry-leading technology and efficiency with our expert services, you will receive dependable, sustainable systems built to provide outstanding comfort and indoor air quality (IAQ) in your commercial buildings. Additionally, three of our four systems – Energence, Strategos® and Landmark® - are ENERGY STAR® certified, which will help lower your energy expenses, leading to a lower total cost of ownership. Call 803-399-7208 to learn more.