Tulsa Commercial Rooftop HVAC Systems Jack Nelson Service Experts Heating & Air Conditioning in Tulsa gives you choice in commercial rooftop HVAC products and services. Lennox® packaged rooftop commercial HVAC systems are top the list of the most innovative products on the market 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 long-lasting, sustainable systems built to bring exceptional comfort and indoor air quality (IAQ) in your commercial spaces. Further, three of our four rooftop systems – Energence, Strategos® and Landmark® - are ENERGY STAR® qualified, which will help decrease your energy expenses, leading to a lower total cost of ownership. Call 918-212-8927 to learn more.