 Distributed by DS Beverages. An energy-efficient train system from Prue Refrigeration and Heating in Crookston is designed for maximum efficiency when matched train components are combined into a complete system. You get more warmth, cooling, and clean air from the energy you use. Air cleaners, humidifiers, and heat pumps, as well as digital thermostats, will return the cost of your investment. It's hard to stop a train. Call Prue Refrigeration and Heating in Crookston.