Austin Commercial Rooftop HVAC Systems Strand Brothers Service Experts Heating & Air Conditioning in Austin 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 reliable, sustainable systems built to deliver outstanding comfort and indoor air quality (IAQ) in your commercial offices. 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 512-592-3072 to learn more.