In traditional hydronic HVAC systems, whether heating or cooling air is supplied to the environment, boilers are needed in winter and chillers (water cooling units) along with pumps and valves are required in summer. In contrast, DX air conditioning units can provide climate control without the need for additional accessories (though they require additional automation equipment).
The unmatched advantage of DX air conditioning units lies in their direct transfer of heat to the air via the DX coil using refrigerant, minimizing energy and heat loss. In terms of energy efficiency comparison, these units present a central system solution with external units that offer low initial investment and operating costs, making them the most suitable choice for energy savings during selection of insulation materials and operation.