Gaithersburg Commercial Rooftop HVAC Systems Parker Pearce Service Experts Heating & Air Conditioning in Gaithersburg gives you choice in commercial rooftop HVAC products and services. For example, Lennox® packaged rooftop commercial HVAC systems are among the most innovative products being sold today, including the new solar powered SunSource® System for Energence® rooftop HVAC systems. Our industry-leading technology combined with our expert installation and services means you’ll receive reliable, sustainable systems built to deliver outstanding 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 reduce your energy expenses, leading to a lower total cost of ownership. Call 301-476-4577 to learn more.