What are truly energy-efficient doors and windows?
Release date:
2025-09-01
Building doors and windows are the weakest points in terms of a building's thermal performance, accounting for 49% of the total energy consumption in a building’s envelope. As living standards continue to rise, indoor cooling or heating systems have become increasingly common as people strive to create comfortable living environments. Since doors and windows serve as one of the building’s primary exterior enclosures, they directly influence the structure’s energy efficiency. Enhancing the thermal insulation of doors and windows is therefore a key strategy for reducing overall building energy use.
Today, whether buildings incorporate energy-efficient doors and windows is drawing growing attention from both homeowners and industry professionals. Meanwhile, with the introduction of national energy-saving regulations and building energy-efficiency standards, energy-efficient door and window products have also captured the interest of many construction businesses. To help their projects stand out in an increasingly competitive market, energy-efficient windows and doors have become a central focus of media promotion and marketing efforts among builders.
However, many still lack a deep understanding of what truly constitutes an "energy-efficient" door or window. Simply using spacer bars made of thermal-break profiles or installing double-glazed hollow glass doesn’t automatically make a product energy-efficient—there’s much more to it than meets the eye.
True energy-efficient doors and windows represent a perfect system integration, where the overall performance is the combined result of every component—none of which can be missing. To determine whether building doors and windows are truly energy-efficient, three key factors should be primarily considered: heat loss (heat exchange), heat convection, and heat conduction and radiation.
1. Convection occurs when gaps in the doors and windows create pathways for circulating hot and cold air, leading to heat exchange and, consequently, heat loss.
2. Heat conduction happens as molecules within the materials used for doors and windows move, transferring heat directly from one surface to another—and this process also results in heat loss.
3. Radiation involves the direct transfer of heat in the form of infrared rays, further contributing to overall heat loss.
Considering these three factors, designing and selecting the right profile material becomes crucial for achieving true energy efficiency in doors and windows.
First, different materials yield profiles with varying performance characteristics—most notably, their thermal conductivity significantly impacts the energy efficiency of doors and windows. When selecting a material, the design of the profile’s cross-section becomes critically important. Let’s take aluminum alloy profiles as an example: unfortunately, in many regions, people still prioritize cost over performance when choosing profiles, particularly neglecting energy-saving considerations. As a result, conventional aluminum alloy profiles are still widely used, despite their inherently high thermal conductivity, which leads to rapid heat transfer. This issue is especially pronounced in colder northern regions during winter, where indoor surfaces often experience condensation, frost, ice formation, and even water dripping. Meanwhile, though these effects may not be immediately visible in southern climates, they still contribute significantly to increased air-conditioning energy consumption.
Fortunately, thanks to recent government policies promoting energy efficiency—and driven by ongoing advancements and innovations in aluminum alloy technology—engineers have developed insulated, multi-chambered aluminum profiles featuring thermal breaks. By incorporating this insulation technology, the rapid heat transfer typical of pure aluminum alloys is effectively blocked, leading to substantial energy savings and improved thermal performance.
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Warren Doors and Windows, south of Fangshan Road and west of Dongtai Road, Dongcheng Subdistrict, Linqu County, Weifang City, Shandong Province
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