In the end it exceeded the sustainability motto of people, planet, profits. The School pushed the design team to find ways to reduce energy. For the design ice system, the challenge was even greater for B32 Engineering Group because the School was not comfortable operating a system with natural refrigerants like CO2 (newer to the ice rink industry) and ammonia (potentially more hazardous and requires additional training for staff) which tend to operate more efficiently than synthetic refrigerants. After evaluating many refrigerant and equipment options, a flooded R-507 based refrigeration system was selected. To improve the efficiency of the R-507 system, a flooded type heat exchanger system was incorporated in the design along with the use of industrial grade equipment.