Abstract: The number, orientation and the type of glazing can significantly affect the amount of energy required to heat or cool a building. Effect of glazing type on solar heat gain through windows for the city (Amman) Jordan is studied. Solar energy gain is calculated using the monthly average data. The effect of window orientation on the total gain is analyzed. It is found that for all directions, solar gain is season-dependent and this dependency varies from one direction to anther. Also, the effect of number of glazing layers together with the glazing type on solar energy gain through windows is given. It is found that, south facing windows should have high SHGC to allow solar heat gain in winter. East or west facing windows should have lower SHGC. Consequently, considerable cooling and heating demand can be reduced when clear glass is replaced by bronze or low-e glass.