Bill Spohn holds a BS & MS in Mechanical Engineering, University Of RochesterRegistered Professional Engineer (PE) in PennsylvaniaBill owns TruTech Tools, LTD, founded in 2007, an award-winning web store selling tools & test instruments to trade contractors. TruTech also provides many educational resources to help contractors do a better job for their customers.Bill has designed & marketed a wide array of test and measurement products in the last 30 years. He regularly teaches technically complex topics to a wide range of audiences on the applications of testing and measurement instrumentation in Heating Ventilation, Air-Conditioning & Refrigeration (HVACR), building science, healthy homes, and Indoor Air Quality (IAQ). He has worked on many national Technical Committees and holds four US patents in instrumentation design. He also consults in instrumentation design, development, and application along with expert witness work on HVAC equipment, heat exchanger, carbon monoxide poisoning, as well as technical education. Bill is on the board of directors of the Building Performance Association and the Green Home Institute as well as on the advisory board for Solar United Neighbors of PA.Bill and his wife Marilyn recently moved into a new net zero home, running on solar, in Indiana Township, PA. The home has many unique attributes including being built in a modular home factory. More info at SpohnHome.com.Bill also hosts the RESTalk and Building HVAC Science Podcasts.