Passive house windows new choice-Vacuum glazed window

Passive house building is an integrited system of high performance thermal materials

Passive house building is an integrited system of high performance thermal materials

Windows and doors are the weakest point in the building, the quality of doors and windows directly determines the comfort of the indoor environment. Passive building require high quality windows and doors, Vacuum glazed windows ,because of its high energy performance,is becoming new choice of passive house windows.

Whats passive house?

Passive buildings take advantage of their own good thermal insulation properties.,Without using traditional active heating and cooling methods such as air conditioning and combi boiler, they passively utilize the solar radiation, human body heat release, indoor lighting, and electrical appliance heat dissipation, as well as heat recovery and fresh air systems. They can meet the energy needs of building heating and cooling with very little energy input.

Passive houses can use various energy-saving technologies to construct the best building envelope and indoor environment, greatly improving the building’s thermal insulation and airtightness, and minimizing the building’s heating and cooling needs.

Passive house building is an integrited system of high performance thermal materials
Passive house building is an integrited system of high performance thermal materials

On this basis, passive houses can also effectively use natural ventilation, natural lighting, solar radiation, etc. to achieve a comfortable indoor temperature, humidity and lighting environment, minimizing dependence on active heating or cooling systems.

Whats the difference between passive house windows and normal windows?

Passive windows have very strict requirements on the aluminum frame, insulation strips, glass, and hardware accessories used in the windows.

According to the research results of the Passive House Institute (PHI) in Germany, the windows of passive houses must meet the following four characteristics:

  1. Three layers of low-energy consumption or equivalent glass;
  2. High thermal insulation warm edge;
  3. High thermal insulation window frame;
  4. Optimized installation method in the wall.

So the Passive windows are made of large and thicker aluminium frame, and the thermal bridge can reach up to 64mm, At the same time, use triple glazing or 4 layers glass with higher performance low-E coating and filled argon. As a result,branded hardware with high load-bearing capacity is required to support the heavy frame and glass. Therefore, the price of passive windows is more expensive than ordinary thermal-broken aluminum doors and windows.

Whats Vacuum glazed windows?

Vacuum glazed windows is windows equipped with vacuum insulating glass.

Vacuum insulated glass is the world existing most energy efficient glass,traditional insulating glass has reached its thermal limit.

  • Low-E coating : From initial solar reflective coating, to single silver low-E,double silver low-E,triple silver low-E coating, low-E coating emissivity has reach the limit to 0.03,and difficult to be decreased further more.
  • Spacer:From stainless steel space,aluminium spacer,warm edge spacer,to now 4SG,TPS spacer,difficult to decrease any more.
  • Gas: Air ,Argon, krypton, no more options.

To meet the requirement of passive house windows,glass has to be thicker and heavy,which brings up the overall costs.

vacuum insulating glass VS normal insulating glass
vacuum insulating glass VS normal insulating glass

Different from normal IGU, vacuum insulating glass use 0.15mm vacuum space to replace the 12mm/18mm/20mm spacer ,bring down glass thickness,the vacuum space also contribute to thinner glass,much better thermal performance,and lighter weight glass.

By applying vacuum double glazing or hybrid vacuum insulated glass into windows,glass brings up windows overall thermal performance significantly as glass account 80% of windows area.

Other components of passive house windows

For passive houses, in addition to considering the thermal insulation performance,solar shading performance that related to energy saving, it is also necessary to consider the structural resistance, watertightness, airtigtness,sound insulation,  and durability related to safety and comfort. This involves various aspects such as design, material selection, installation, and maintenance, and is also related to the performance of various components such as door and window frame profiles, glass, thermal bridge, hardware, and accessories.


VIG windows not only applying VIG into windows,but also keep excellent raw materials and elegant design to reach the other points of passive house windows.

Aluminium frame: Different from 6063-T5, 6063-T6 windows, our VWS70/VWP91 aluminium windows use 6066-T66 aluminium profiles,which has 29% higher tensile strength, 23% higher yield Strength ,7% higher Vickers hardnes,13% maximum percentage elongation .

Thermal bridge:Technoform thermal bridge is made with poyamide 6.6 with 25% fiberglass reinforcement to ensure high impact resistance and excellent thermal performance.

25 Years warranty EPDM Rubber-Automobile level EPDM rubber,low heat transfer coefficient,better air tightness.

Vacuum Glazed windows price

In the market ,you can easily find vacuum insulating glass costs over USD200/SQM,and sometimes over USD300/SQM,so the questions will be: Will vacuum glazed windows expensive ?

The answer is no,VIG windows ,design,fabrication ,assemble are finished in China.With our world class vacuum insulated glass technology that can realize large scale VIG production,vacuum double glazing price is slightly higher than U.S double glazing.

The mature windows industry also contribute to lower production costs, whether aluminium profile costs,labor costs, and logistic costs.

vacuum insulating glass production
vacuum insulating glass production

More important is,the appearance of VIG make passive house no longer heavy,thick,and passive house can be slim,affordable.

VIG windows price is 50% lower than U.S equivalent performance windows,whether it’s PVC windows or aluminium windows.

People now can enjoy the most advanced windows technology with lower price,enjoy the comfortable and quiet living environment,windows can be continuous energy investment,saving your cooling and heating costs,and add extra value to your hose.

More important, VIG windows are tested and certified by AAMA/NFRC and some model has reached energy star standard,enjoy the government grant when you replace your windows with our VIG windows.

Act now for your marvelous energy investment.


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