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In the face of growing shortages and rising prices for fuel and energy resources, the problem of energy conservation and the use of alternative energy sources to solve the problem of reducing energy consumption for the Ukrainian economy become very important. Today, the use of air splitconditioner heat pumps in buildings' heating systems is becoming more common. Therefore, the improvement of the design and operation of power equipment to which air split-conditioner heat pumps (“air-air”) are related is related to a detailed study of their operation and an objective assessment of their degree of energy perfection, which can only be determined on the basis of analysis their exergy efficiency. This made it possible to substantiate the relevance of such a research task due to the insufficient information on the operating modes related to the influence of air flows on the condenser and evaporator on the corresponding condensation and evaporation pressures and the exergetic efficiency of the use of air split-conditioners. For this article it was used the author's innovation mathematical model to analysis of the operation of one-step freon heat pumps, which are used in air split-conditioners, according to the exergetic method. The dependence of condensation and evaporation pressures and exergetic output-input ratio (OIR) on the example of „Mitsubishi Electric” firm air split-conditioner heat pump with the nominal heating capacity of 3067 W under the standard external temperature conditions on the refrigerant R32 was determined from the condenser and evaporator air flows.