Systems that use solar as a renewable and green energy, especially in warm countries, can be used to supply heating/cooling energy. In this research, a transient simulation model of solar-assisted heating and cooling systems (SHCs) was investigated for a duplex house in a northern city of Iran. It should be noted that the simultaneous use of electrical energy during the day to cool domestic and industrial buildings increases peak electricity demand, so this matter generates many problems. The cooling capacity of the absorption chiller and the solar collector area was designed on the basis of the maximum cooling load, and the auxiliary gas-fired boiler was also used in summer to feed the absorption chiller, in case of scarce solar irradiation. The building was simulated using a single-lumped capacitance model and developed by Matlab software, including analysis of the dynamic behavior of the building in which the SHC systems were supposed to be installed. The results of the case study were analyzed on a monthly basis, paying special attention to the energy. The results are encouraging as to the potential of saving energy. In contrast, SHCs still appear far from economic profitability; however, this is notoriously true for the great majority of renewable energy systems.

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