The present invention relates to a hot water heating system using condensation waste heat as an evaporation heat source through ceiling ventilation, wherein the system is capable of collecting, as an evaporation heat source, waste heat released by ventilation and aeration for temperature control when crops are grown in a closed building structure such as a vinyl house, a green house, or a water culture room, and capable of recycling the waste heat for hot water and heating source. One or more automatic absorption dampers are installed above the building structure and the centers of the automatic absorption dampers are connected by a mixing chamber. A ceiling ventilation evaporation heat exchanger installed at one side of the mixing chamber introduces and ventilates external air while the condensation waste heat absorbed into the ceiling ventilation evaporation heat exchanger is sucked to a compressor through a suction branch tube and a liquid separator. The compressor stores the heat in a hot water heating tank through a hot water condensation heat exchanger. The hot water heating tank supplies the heat to ground-floor heating and convection heating coils by a circulation pump for heating and circulates the heat through the hot water condensation heat exchanger by a hot water pump. The hot water condensation heat exchanger collects a coolant into a receiver tank through the condensation waste heat exchanger to allow respective electronic valves and expansion valves to be operated. The gas evaporated from the ceiling ventilation evaporation heat exchanger, the condensation waste heat exchanger, and an external heat evaporation heat exchanger is absorbed into the compressor through the suction branch tube and the liquid separator, and then discharged.본 발명은 비닐,온실하우스 및 수경재배실과 등과 같은 밀폐된 건축구조물에서 작물을 시설재배 시 온도조절을 위하여 통풍 및 환기 시에 배출되는 폐열을 증발열원으로 회수함과 동시에 온수 및 난방열원으로 재활용할 수 있게 한 천정환기를 통한 응축폐열을 증발열원으로 이용한 온수,난방시스템에 관한 것으로 건축구조물의 상부 측 방향에 하나 이상의 외기흡입 자동댐퍼는 천공된 구멍을 갖는 리턴덕트를 통하여
