The start-stop process of units integrated with air-source heat pumps (ASHPs) and freezer affects the heating performance of the heat pump system and the performance of the freezer. In this study

the performance of the integrated unit under separate operation and combined operation conditions was studied experimentally considering the start-stop process of the ASHP system. The effect of the start-stop times of the ASHP on the performance of the heat pump system and freezer system was analyzed. The experimental results indicated that compared with the different operating conditions of the heat pump

the attenuation start time of the heat pump heating capacity in the integrated unit was delayed by approximately 10 min

and the heating capacity and COP under the combined operation condition were both higher than those in the different operating condition. Under the combined operation condition

the average heating capacity and average COP of the ASHP under the three time start-stop condition were reduced by 18.2% and 27.3%

respectively. The average power consumption was increased by 16.3% compared with that under the one time start-stop condition. Correspondingly

under the three time start-stop condition of the heat pump

the average refrigeration capacity and average COP of the freezer system were reduced by 11.6% and 11.1% respectively compared with the one start-stop condition of the heat pump.