An industrial heat transfer unit including a compressor, a condenser heat exchanger, an expansion valve structure, and an evaporator heat exchanger. The compressor outlet is fluidly connected to the condenser heat exchanger inlet; the condenser heat exchanger outlet is fluidly connected to the expansion valve inlet; the expansion valve outlet is fluidly connected to the evaporator heat exchanger inlet; and the evaporator heat exchanger outlet is fluidly connected to the compressor inlet. The condenser heat exchanger is retained vertically above the compressor to provide enhanced operational efficiency. In some embodiments, service regions of the compressor and heat exchangers face a housing window. Process lines of the heat exchanger(s) can be high pressure stainless steel tubes. The compressor can be a scroll compressor and can include a variable frequency drive controlling delivery of power to a motor.