Quick Answer
Overhangs, awnings, and solar screens work best for passive solar homes to control direct sunlight and heat gain, while preserving winter sunlight and views.
Effective Overhangs for Passive Solar Design
An overhang is an extension of a roof or wall that provides shade for south-facing glazing during the summer months. A well-designed overhang can reduce summer heat gain by 30% to 50%. For optimal performance, an overhang should be at least 7 to 10 feet deep and extend 2 to 3 feet beyond the exterior wall of a south-facing window.
Awnings for Additional Shade
Awnings are a popular shading device for passive solar homes. They can be fixed, retractable, or motorized, and are typically mounted above windows or doors. Awnings can reduce summer heat gain by 25% to 40%, and can also help to protect windows from rain and hail. For maximum effectiveness, awnings should be installed at an angle of at least 45 degrees and be at least 2 feet deep.
Solar Screens for Year-Round Performance
Solar screens are a type of shading device that can be installed on windows and doors to reduce heat gain and maintain views. They are typically made of a mesh material that allows 60% to 80% of natural light to pass through, while blocking 80% to 90% of direct sunlight. Solar screens can be installed year-round and can help to reduce cooling costs by up to 30% during the summer months.
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