Tunkou house why dark and damp

Tunkou House is located in the western mountainous region of Hunan, subtropical monsoon climate, high temperature and rain in summer, low temperature and rain in winter, residential materials such as timber and stone, and small windows, so ventilation, lighting, insulation performance is poor, dark and humid all year round. "Tunkou House" is a typical traditional house in western Hunan, the walls are mainly made of timber, rammed earth bricks, stone, etc., and the roofing materials are small green tiles and flaky stone, and the whole building only has windows in the front fa?ade, which are small, and the window frames are mostly wooden.