PURPOSE: To enable cooling in summer and heating in winter, by vertically disposing heat radiation and absorption plates bonded with coolant tubes in a solar heat pump which performs a cooling/heating cycle and by providing eaves for preventing direct sunlight irradiation above the heat radiation and absorption plates and using the plates as outdoor heat exchangers.

CONSTITUTION: A cooling cycle is effected by a compressor 1, a four-way valve 2, a pipe 3, coolant pipes 5 on heat radiation and absorption plates 4', a pipe 6, a decompressor 7, a pipe 8, an indoor heat exchanger 15', a pipe 10, etc. A coolant absorbs heat from a room and releases it through the coolant pipes 5 and the heat radiation and absorption plates 4'. Since eaves 20 are provided, irradiation by the direct sunlight is prevented and the surface temperature is held to about 45°C. Since there are gaps, air flows up smoothly. Cooling is thus enabled in summer. For heating, an opposite cycle is effected. Sunlight 19 is irradiated upon the entire surface of each heat radiation and absorption plate 4' to enable the heating. According to this constitution, energy is economized.