The results from building simulations, of window shading profiles in summer, indicate that if shutters remain open on the north and west orientated fenestration, the increase of solar gains and consequently the rise of indoor temperature is insignificant. This causes no deviation from comfort levels (0.1 to 0.2 degrees, Tables 2, 1.4, 1.3, 1.2 and 1.1). This is mainly attributed to:

i) Area — The window area on North and West sides is limited.

ii) Orientation — There is no direct solar incidence on these facades.

In case half of South facing glazing is left unshaded, in summer, the solar gains increase rising indoor temperature by 0.1 to 0.6 degrees centigrade and reaching 1.2 degrees increase as the unshaded window area extends to all South fenestration area. However, the temperature increase causes no deviation of indoor temperature from comfort levels (Table 2, 1.2, 1.3, 1.4). This is attributed to two main reasons:

i) Orientation — South orientated windows have no direct solar insolation in the summer.

ii) Design — The optimized design of overhangs and extended vertical walls for south glazing. The above results indicate the effectiveness of the optimization of permanent shading devices.