In regions with extreme temperature fluctuations, standard metal frames can act as a thermal bridge, allowing heat to escape in winter and enter in summer. The development of thermally broken windows addresses this issue by inserting a non-conductive material, usually a polyamide strip, between the interior and exterior aluminum profiles. This "break" effectively stops the transfer of heat, keeping the indoor frame temperature consistent regardless of the weather outside. Not only does this improve the comfort of the living space, but it also significantly reduces the workload on HVAC systems, leading to a noticeable decrease in monthly energy expenditures.
The manufacturing of thermally broken windows has become much more sophisticated, with many companies now using PA66 fiberglass-reinforced strips for superior strength and insulation. This technology also prevents the common problem of condensation forming on the inside of the frame, which can lead to mold growth and damage to interior finishes. Industry news indicates that as green building certifications become more stringent, the width of the thermal break is increasing to meet lower U-value requirements. When choosing a supplier, it is important to verify that the thermal strip is mechanically crimped into the aluminum, as this ensures the structural integrity of the entire window unit under heavy wind loads and thermal expansion.
