A new form of composite air carry energy radiant end combined with roof and sidewall is proposed. An office building is taken as the research object and the heating performance of the composite air carry energy radiant end in cold-winter and high-humidity climate zone is studied by an experimental method. The results show that the composite air carry energy radiant air-conditioning system can reach a stable state within 30 minutes after opening. Compared with traditional air-conditioning system, it has faster heating rate and stronger stability, and the indoor temperature change is relatively uniform after stabilization. The system has good heating performance in winter. In the range of human activity (0.2 m to 2.2 m from the ground), the indoor air temperature is 16.5 °C ~ 18.2 °C, and the relative humidity is 33% ~ 36%. The heating requirement in winter can be met when the temperature is set at 16 °C. In addition, the system can effectively improve the situation that floor temperature is too low due to the occlusion of objects, thereby effectively avoiding local discomfort. The composite air carry energy radiant end combined with roof and sidewall can meet the demand of heating in winter and has the characteristics of energy saving and comfort. The results can provide some guidance for the practical application of air carry energy radiant air-conditioning system in cold-winter and high-humidity climate zone in the future.