Ron Auvil is a Staff Instructor for HVACRedu.net. He has 38 years of HVAC and Controls Experience. This includes 35 years teaching experience. He has worked as a senior controls technician for Johnson Controls. He has also taught HVAC controls classes across the United States for Johnson Controls, Honeywell, and others. He has written the definitive textbook on pneumatic and DDC control systems HVAC Control Systems 3rd Edition, from American Technical Publishers.