Saint Charles Commercial Rooftop HVAC Systems Golden Seal Service Experts Heating & Air Conditioning in Saint Charles gives you choice in commercial rooftop HVAC products and services. For instance, Lennox® packaged rooftop commercial HVAC systems are are some 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 designed to deliver superior comfort and indoor air quality (IAQ) in your commercial spaces. Additionally, three of our four units – Energence, Strategos® and Landmark® - are certified by ENERGY STAR®, which will help lower your energy expenses, meaning you’ll have a lower total cost of ownership. Call 630-246-2698 to learn more.