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High performance windows with new glazing technologies not only reduce energy costs but
make homes more comfortable as well.
Source: Lawrence Berkeley National Laboratory (Lyons and Arasteh).
 Winter Thermal Comfort
An older window with a lower glass temperature feels colder because more heat is radiated
from a person's body to the window. Cold glass can also create uncomfortable drafts as air
next to the window is cooled and drops to the floor. This sets up an air movement pattern
that feels drafty and accelerates heat loss. High performance windows with lower U-factors
will result in a higher interior window temperature in winter and thus greater comfort.
Proper installation along with weatherstripping designed to seal tightly (for operable
windows) will also improve comfort by reducing cold air leakage.
Source: Lawrence Berkeley National Laboratory (Lyons and Arasteh).
Summer Thermal Comfort
In summer, strong direct sunlight strikes people and interior surfaces, creating
overheating and discomfort. Windows with low solar heat gain coefficients will reduce the
solar radiation coming through the glass and associated discomfort. Low solar heat gain
low-E glass (spectrally selective) reduces heat gain while still providing sufficient
light and view.
Source: Lawrence Berkeley National Laboratory (Lyons and Arasteh).
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