The design factors examined in this study included window geometry, location, and distribution on the facade, shading device geometry, and material properties. Window variables consisted of: total window area, window shape (narrow or wide), vertical location of windows on the façade, horizontal location on the façade, number of windows, and window distribution on the façade. The number of windows variable did not affect the total area; for the larger number of windows, each individual window area was decreased so that the total area remained the same. The window distribution variable referred to the distance between each window. Shading device variables consisted of: existence of a horizontal overhang and existence of vertical fins. The horizontal overhangs were dimensioned to block direct sunlight on the equinox at noon in Boston, MA. The vertical fins had the same length as the overhangs. Material variables consisted of: glazing transmissivity and interior reflectances of walls, ceiling, and floor. The glazing transmissivities corresponded to clear glass and tinted glass. The interior reflectances corresponded to near-white surfaces and to medium gray surfaces. The values examined for each design factor are indicated in Table 1.