Dayton Commercial Rooftop HVAC Systems Stevenson Service Experts Heating & Air Conditioning in Dayton 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 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 long-lasting, sustainable systems built to provide superior comfort and indoor air quality (IAQ) in your commercial spaces. In addition, three of our four systems – Energence, Strategos® and Landmark® - are certified by ENERGY STAR®, which will help reduce your energy expenses, meaning you’ll have a lower total cost of ownership. Call 937-503-7896 to learn more.