The U-value is used to refer to the amount of heat that can pass through a window, called thermal transmittance, with a lower score being better.
[2][3] Most governments in several countries offer tax breaks or rebate to promote installation of energy savings systems (windows, boilers, insulation, etc.)
Below is a list of technologies that decrease heat transfer in windows: Double and triple glazing are critical for energy efficiency.
Modern double, triple and quadruple-glazed windows have thin, metallic low-e coatings on the panes, which can significantly improve their thermal insulating performance.
The material used for this insulating bar stands out for its low thermal conductivity value (0.30 W/m2K) and its good mechanical properties even at higher temperatures.
The type of window frame and the insulation of its cavity are critical for energy-efficiency and thermal performance (and for strength, durability and maintenance).
Certain windows have vinyl or fiberglass frames that feature chambers, to further enhance insulation and noise reduction.
In moderate and hot climates, quality double-glazed windows with a U-value of about 0.30 are generally a more cost-competitive and effective choice.