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The MacBone Model CHV24-7, 24,000 BTU/hour, cooling and heating unit is a vertical- or side-mounted, unitary or self-contained unit, with a closed, precharged air conditioning circuit, driven by a single, integral, hydraulic motor. The unit can be quickly removed for service without involving the sealed refrigeration circuit. Cooling is provided by a thermostatically controlled automotive type compressor, using refrigerant 134A, with heating derived from engine hot water or hot oil.