In this paper, dynamic energy analysis of the coil energy recovery loop's efficiency during the whole year, in dependence of the operating conditions, i.e. outside air thermodynamical state, was performed. A coil energy recovery loop is one of the air-to-air sensible heat recovery systems with finned tube water coils, placed in the supply and exhaust air streams and connected in a closed loop via counterflow piping. For this purpose, the original simulation model of a complex air-conditioning system, which includes both the coil energy recovery loop and the heat pump, was developed. The developed simulation model enables hourly analysis of the system operation during the whole year, together with monitoring of both consumption and recovery of heat and mass for the system parts, electricity consumption of the electrical appliances, and also with determination of hourly efficiency values for the air-to-air heat recovery system. The model is applicable to a room of any dimensions or orientation, where a heating, i.e. cooling load is determined by solving the unsteady heat conduction equation system through the building's construction elements. The measurements were performed to determine heating, i.e. cooling capacity of the coil energy recovery loop in different operating conditions. For this purpose, the experimental rig was designed and installed in order to conduct the measurements on the coil energy recovery loop, placed in the air-conditioning unit in its real dimensions. Based on the measurement results, the system efficiency analysis for the measured operating points set was performed. With the simulation model for dynamic energy analysis of a complex air-conditioning system during the whole year, consistent and stabile results were obtained, and their reliability was proven by comparison with the measurement results. The results have shown that together building of both the coil energy recovery loop and the heat pump into the air-conditioning unit, does not increase the energy saving significantly in comparison to the air-conditioning unit with the heat pump only. On the other hand, in former case is possible to apply the heat pump with smaller electrical power. The energy saving in comparison with the standard air-conditioning unit has been proven to be very significant, which points out the importance of energy management in the air-conditioning processes during the year. The optimization of the complex air-conditioning units operation has many, not only financial, but also environmental protection advantages. The obtained results for the secondary parts of the air-conditioning systems were prepared for further complete both the energy and the economy analysis, which should include the investment costs, the energy and fuel costs and the maintenance costs. The developed simulation model is flexible and has the possibility to include different types of air-to-air heat recovery systems or other air-conditioning systems in order to perform. their analysis and/or their mutual comparison.