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high-reflectivity window film
A type of window film that helps block
summer heat gain. High-reflectivity films are best used in climates with
long cooling seasons because they also block the sun's heat in the winter.
The effectiveness of these reflective films depends on many factors:
- Size of window glazing area
- Window orientation
- Climate
- Building orientation
- Whether the window has interior insulation
Silver, mirror-like films typically are more effective than the colored,
more transparent ones. East- and west-facing windows, because of their greater
potential for heat gain, can benefit more from these films. North-facing
windows won't really benefit from them at all, and south-facing windows
may benefit somewhat, but the benefit could be offset by the reduction of
heat from the winter sun.
These films have some overall disadvantages:
- Loss of interior light or visible transmittance
- Impaired outside visibility
- Extra care required for cleaning
- Reflections
These reflective films are available to apply yourself over existing windows.
Some window manufacturers also make reflective glazing or glass.
Related category
• WINDOWS
TOPICS
Source: US Department of Energy
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