Intercepting sunlight before it reaches the walls and glazing of a building dramatically reduces the amount of heat entering that building.
External shading devices can reduce solar heat gain through glazing by up to 80%. By designing shading devices according to the sun’s seasonal path, both summer shading and winter solar gain can be achieved in climates with seasonal variations.
Incorporate the following shading strategies:
- Horizontal overhangs or louvers for solar orientations (facing the equator); and
- Vertical fins and egg-crate designs for other orientations.
Adjustable shading devices can be repositioned to allow for seasonal temperature variations or user control during unusually warm or cool periods. Additional shading strategies include recessing glazed openings, and incorporating porches, balconies, and mature vegetation to shade east and west walls as well as outdoor areas.