Extra ceiling height or solar chimneys create air movement by stack effect; in particular, wind towers are really effective, since they create a         breeze and promote cooling by evaporation.
Other techniques
        Radiative cooling towards the clear sky can give considerable dissipation of heat, especially from surfaces with a high sky view factor, such         as a roof.
        The gain of insulating the roofs for solar protection during the day or for reducing heat losses in cold seasons, is however often greater;         finally, there are prototypes for ‘sky coolers’, but they are far too complicated or expensive for practical and low-cost use.