Mrs. Bellenger is a professional engineer registered in New York, Pennsylvania, Arkansas, and Massachusetts. With more than 30 years of experience in Energy Engineering, she pioneered techniques that are widely used today, such as redesigning and rebalancing HVAC systems to meet actual cooling loads. A specialized area of expertise, energy services focuses on identifying, analyzing, and designing measures to reduce operation expenses. She has extensive experience in conducting comprehensive energy audits to evaluate building energy use and analyze retrofit options.

Mrs. Bellenger is President of the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE), an international engineering society with 50,000 members. She is certified by ASHRAE as a Building Energy Modeling Professional and a High-Performance Building Design Professional.