HVAC Excellence has appointed Dr. John. E. Hohman director of Research and Assessment Validation. Dr. Hohman has 40 years’ experience as an HVAC instructor and administrator at both the university and community college level. He has also worked in the industry as a technician, engineer, contractor, wholesaler and manufacturers rep. Dr. Hohman holds a patent in a refrigeration specialty for cascade refrigeration, part of Environmental Test Conditioning.