The project includes two Sabroe Dual PAC heat pumps in parallel. Each heat pump uses two compressors in series (boost and high-stage) with 12 and 16 cylinders, respectively. The electric motors are IP55 rated and compatible with variable frequency drives (VFDs). The starters are medium-voltage (4160 VAC) VFDs. The evaporator is a cascade shell and plate type. The condenser is a high-efficiency shell and plate type with a sub cooler, condenser, and desuperheater design. It includes motorized expansion valves, oil recovery, and refrigerant level sensors. The minimum refrigerant charge is 115 kg of ammonia per heat pump.