Do you know how much your home's doors and windows are costing you each year?
Release date:
2025-09-01
We end up spending nearly twice as much each year on our home's energy-inefficient windows and doors!
When you're enjoying the comfort of air conditioning or underfloor heating indoors, keeping doors and windows tightly closed only addresses heat convection—it doesn’t stop heat from being conducted through the materials. As a result, significant amounts of indoor energy escape to the outdoors via your home’s doors and windows, leading to wasted energy and higher utility bills. But if your doors and windows were more energy-efficient, the situation would be entirely different.
One day in early 2008, a German businessman renovated his villa located in the suburbs of Beijing by installing energy-efficient windows and doors that meet European standards, aiming to make the property compliant with Germany’s “Passive House” green and energy-saving criteria. After the energy retrofitting, he was amazed to find that during summer, the indoor temperature remained a cool 8°C lower than outside—even without air conditioning. As a result, his monthly electricity bills dropped by half compared to before. And even when he did turn on the AC, it no longer had to run as frequently to maintain comfort, leading to significantly reduced noise levels and a much-enhanced sense of coziness.
In fact, the importance of energy-efficient doors and windows has long been widely recognized in developed countries. According to the "2013-2017 China Metal Doors and Windows Industry Development Prospects and Investment Forecast Analysis Report," in Europe, the proportion of energy-efficient doors and windows has already reached 67% of the total window and door stock. Meanwhile, in China, the vast majority of doors and windows—primarily made of non-energy-efficient PVC and conventional aluminum alloys—account for nearly all installations, with energy-efficient models representing just 0.4% of the total window market.
Energy-inefficient doors and windows not only force households to spend significantly more money on daily energy bills—often unnecessarily—but also lead to massive national energy waste. Surveys reveal that, in China, building energy consumption has accounted for over 20% of the country’s total energy use since 2000. With the rapid growth of the real estate sector in recent years, building energy consumption has now surged to more than 40% of the nation’s overall energy usage. Meanwhile, energy losses through doors and windows alone account for roughly 50% of building energy consumption—and by extension, about 20% of the country’s total energy waste.
The low adoption rate of energy-efficient doors and windows has resulted in China's building energy consumption being more than three times higher than that of developed countries. According to estimates from relevant authorities, if the energy efficiency of doors and windows across China's existing 43 billion square meters of building space could reach current European standards, it would save an impressive 420 million tons of standard coal annually—equivalent to 20% of the country's total annual coal production. Reducing coal consumption would directly help curb smog formation, as the heavy reliance on coal for centralized heating systems is one of the primary drivers behind frequent winter smog episodes in northern China. As a result, the resulting improvements in public health and ecological conditions—along with other positive outcomes—would far outweigh the costs associated with upgrading to energy-efficient windows and doors.
"Now, the hidden energy waste is hundreds or even thousands of times greater than the waste from eating and drinking—especially when it comes to doors and windows, which act like massive 'leaky funnels.' Everyone relies on doors and windows in their homes, yet most people today simply don’t understand how to optimize them for energy efficiency," explained Ni Shouqiang, Vice President of the China Building Metal Structure Association, shedding light on the underlying issue.
What is energy-efficient window and door design? In the window and door industry, there’s a term called the heat transfer coefficient, or K-value. The higher the K-value, the more heat is transferred—and consequently, the greater the energy loss. Conversely, the lower the K-value, the less heat is lost, resulting in reduced energy waste.
According to current EU standards, the U-value for doors and windows is typically specified between 1.1 and 1.3. In recent years, Germany has lowered its window U-value standard from 1.3 to 1.1, while Switzerland adjusted its standard from 1.3 down to 0.7. Meanwhile, France aims to achieve zero-energy buildings by 2020.
In contrast, the current state of energy-efficient doors and windows in China is cause for concern. We lag behind developed countries by nearly 30 years—for instance, Shanghai’s implemented K-value of 2.8 is equivalent to Germany’s standard set in 1984.
Fortunately, relevant government departments have already recognized the importance of energy-efficient doors and windows. Across the country, stricter energy-saving standards for doors and windows are being developed and implemented. In regions like Beijing and Tianjin, the K-value standard of ≤2.0 has already been adopted, while Inner Mongolia and Northeast China have also introduced a standard of ≤2.2.
At the 2009 Copenhagen Climate Conference, Premier Wen Jiabao solemnly pledged to the world: "By 2020, China will reduce carbon dioxide emissions per unit of GDP by 40% to 50% compared to 2005 levels, and non-fossil fuels will account for 15% of the country's primary energy consumption by 2020."
This commitment signals that, over the next five years, China will implement robust measures to intensify its efforts in energy conservation and emission reduction. Among these, building energy consumption—particularly in sectors like construction, which already accounts for a significant share of societal energy use—will face the most immediate challenges. As windows and doors serve as key architectural elements responsible for natural lighting and ventilation, they actually contribute up to 50% of a building’s overall energy demand. Consequently, the window and door industry is poised to undergo an inevitable shift toward energy-efficient solutions.
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Contact Address: No. 7, Industrial Avenue East, Songxia Industrial Park, Shishan Town, Nanhai District, Foshan City
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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