Greg Nahn

Greg has spent over two and a half decades working in support of the design, delivery, and validation of effective residential building energy efficiency programs. He is an exceptional trainer, communicator, and auditor playing a critical role in the ongoing support and development of energy professionals throughout Wisconsin and the Midwest. He designs and delivers effective building science training with a focus on fundamentals, health and safety, diagnostic testing, comprehensive work scope development, and quality installation. Greg is a long time RESNET certified Rater, Rater Trainer and Quality Assurance Designee and holds multiple Building Performance Institute certifications. 

Aside from training, Greg is one of the leads at Slipstream for building performance inspection and certification, including testing and project verification for manufactured homes, existing site-built homes, new construction residential code compliance, and ENERGY STAR® single and multifamily new construction housing. As a long-time champion of residential energy efficiency and an auditor working in the field, Greg has proven himself as a tireless ambassador for efficiency first and the promise of a more sustainable clean energy economy and carbon-free energy future.