LLumar window film helps reduce energy costs in the summer by not allowing excessive heat gain to get through your glass; however the opposite is true for the winter. LLumar window films can lower heating and cooling expenses by rejecting solar heat from the outside, eliminating hot and cold spots inside, and helping to prevent heat from escaping.
International Window Film Association stated the following
“The energy crisis of the early 1970s prompted an interest in another aspect of window film use: the reduction of heat loss to the outside. It was discovered that polyester film tended to absorb and reradiate long wave infrared heat rather than act as a transparent medium. Through experimentation, new film materials and constructions were developed that enhanced this characteristic. These films greatly improved heat retention within a room’s interior.”
The illustration below shows how window film works:
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