Birmingham Commercial Rooftop HVAC Systems Norrell Service Experts Heating & Air Conditioning in Birmingham gives you choice in commercial rooftop HVAC products and services. For example, Lennox® packaged rooftop commercial HVAC systems are are some of the most innovative products you can find today, including the new solar powered SunSource® System for Energence® rooftop HVAC systems. Bringing industry-leading technology and efficiency with expert installation and service means you receive reliable, sustainable systems designed to deliver exceptional comfort and indoor air quality (IAQ) in your commercial buildings. Further, three of our four units – Energence, Strategos® and Landmark® - are ENERGY STAR® certified, which will help decrease your energy expenses, meaning you’ll have a lower total cost of ownership. Call 205-267-0023 to learn more.