The present invention relates to a heating and cooling system for a greenhouse, and more particularly, by circulating water by zones so that heat exchange of heating water or cooling water flowing in a length pipe for each zone disposed along the width direction of the greenhouse is effected for heating or cooling. The present invention relates to a greenhouse heating and cooling system that can conveniently perform temperature control, improve temperature and quality of crops, and reduce energy costs by uniformizing temperature deviations in a greenhouse rapidly. Greenhouse heating and cooling system according to the present invention, the greenhouse cooling and heating system, supply water distribution line connected to the water supply source； A supply side heat exchange line branched from the supply water distribution line and disposed along the longitudinal direction of the greenhouse, and a recovery side heat exchange line in communication with the supply side heat exchange line and disposed along the longitudinal direction of the greenhouse, A heat exchange line disposed in the furnace； A circulation water recovery line connected to the recovery side heat exchange line and connected to a recovery point of the water； A heat exchange line connection unit connecting the supply side heat exchange line and the recovery side heat exchange line to each other； A control valve installed at the supply side heat exchange line and the recovery side heat exchange line, the control valve being operated to form a closed circuit if necessary, the supply side heat exchange line, the recovery side heat exchange line, and the heat exchange line connection part； And it characterized in that it comprises a water circulation pump installed in the heat exchange line.본 발명은 온실용 냉난방 시스템에 관한 것으로서, 더욱 상세하게는, 온실 폭방향을 따라 배치된 구역별 길이배관으로 유동하는 난방수 또는 냉방수의 열교환이 효과적으로 이루어지도록 용수를 구역별로 순환 시킴으로써 난방 또는 냉방 온도제어를 편리하게 수행할 수 있고, 온실내 온도편차를 신속하게 균일화함으로써 작물의 성장도 및 품질을 향상시킬 수 있고 에너지비용을 절감할 수 있는 온실용 냉난방 시
