Calgary Commercial Rooftop HVAC Systems A1 Chesney Service Experts Heating & Air Conditioning in Calgary gives you choice in commercial rooftop HVAC products and services. Lennox® packaged rooftop commercial HVAC systems are among the most innovative products on the market 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 long-lasting, sustainable systems built to bring exceptional comfort and indoor air quality (IAQ) in your commercial offices. Additionally, three of our four systems – 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 587-315-5271 to learn more.