Talking about solar gains is better to limit this parameter to avoid an increase of internal air temperature; to make it possible we can use some type of shading device or overhang to limit the solar gains through the windows especially during summer season, overhang is good here because stop solar radiation during hottest season and hottest hours in the year, due to the sun inclination in these periods. To stop also solar radiation, we can use external threes that are able to stop direct solar radiation. For improve the heat losses due to radiation we can use the temperature of the sky especially during night without clouds where the building can directly “see” the sky.
ROOF