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CSL# 841410
Natural Lighting: The Basics
Natural Lighting Strategies
A well designed home maximizes the use of natural lighting without compromising energy efficiency. Consider
the following steps.
Locate Windows with Daylighting in Mind
Good lighting begins with the effective use of sunlight. Consider the size, location and primary function of the
windows. Will the window frame a view, capture prevailing breezes, allow adequate light, provide architectural
balance?
Low-E Glazing
Low-emittance (low-E) windows keep the heat inside in winter and outside in summer. They have a thin film
applied to the glass that improves the performance of the window.
The two most important indicators of a window's performance are the U-factor and the Solar Heat Gain Coefficient
(SHGC). The U-factor measures how well the window insulates. The lower the U-factor, the better the insulation
value. The SHGC measures how well the window blocks heat from the sun. The lower the SHGC, the less solar heat
the window lets in.
Seasonal Window Shading
Window treatments like window films can be added to windows to keep heat from the sun from entering the home.
Shades and blinds can also be closed during peak solar hours to prevent overheating.
A well designed home maximizes the use of natural lighting without compromising energy efficiency. Consider
the following steps.
Locate Windows with Daylighting in Mind
Good lighting begins with the effective use of sunlight. Consider the size, location and primary function of the
windows. Will the window frame a view, capture prevailing breezes, allow adequate light, provide architectural
balance?
Low-E Glazing
Low-emittance (low-E) windows keep the heat inside in winter and outside in summer. They have a thin film
applied to the glass that improves the performance of the window.
The two most important indicators of a window's performance are the U-factor and the Solar Heat Gain Coefficient
(SHGC). The U-factor measures how well the window insulates. The lower the U-factor, the better the insulation
value. The SHGC measures how well the window blocks heat from the sun. The lower the SHGC, the less solar heat
the window lets in.
Seasonal Window Shading
Window treatments like window films can be added to windows to keep heat from the sun from entering the home.
Shades and blinds can also be closed during peak solar hours to prevent overheating.