PURPOSE: To introduce solar heat into hut space in a large quantity according to circumstances, thereby the air can be forced to flow efficiently in a building such as an air cycle dwelling house where the air flows in the interior space.

CONSTITUTION: In an air cycle dwelling house, a solar battery 10 is disposed in such a position as to easily receive sunlight like a roof surface, a sunlight transmitting part 5 is provided on a part of the roof surface, and the transmitting part 5 is covered with a shielding member 6 having heat insulation performance in such a manner as to be freely opened and closed. The operating mechanism of the shielding member 6 is operated by using the solar battery 10 as a power supply. The operating mechanism can be also operated according to an output signal from a photo sensor. Thus, solar heat can be efficiently introduced into a building to energize flow of air in the interior of the building, whereby the temperature and the humidity in the building can be effectively adjusted.