Douglas Reindl's research in thermal energy systems ranges from energy production using solar thermal systems and photovoltaics to end-use applications in areas such as refrigeration and air-conditioning. Much of his work involves the development and use of mathematical models for the purpose of simulating the energy and economic performance of these thermal systems. As the founding director of the Industrial Refrigeration Consortium, he works extensively to improve the safety, efficiency, reliability and productivity of ammonia refrigeration infrastructure.