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Today we will discuss a topic that may not seem the most exciting at first glance but is extremely important for each of us – the thermal permeability of windows. You may be wondering what it is and why it is an essential component of home energy efficiency. Let me explain!



The thermal transmittance of a window, also known as the U-value, refers to the window’s ability to conduct heat from one side to the other. The lower the U-value, the better – it means that the window will better insulate our house against heat loss in the winter and against the influence of heat in the summer. On the other hand, a low thermal transmittance window allows us to reduce the usage of heating and air conditioning, which translates into lower energy bills and a reduction in our carbon footprint.

sustainability in window industry

So why is the thermal transmittance of windows so decisive for the energy efficiency of our homes? Here are some key reasons:

1. Energy saving: As previously mentioned, low U windows prevent heat loss in winter and hot air infiltration in summer. Thanks to this, our heating and air conditioning system does not have to work harder to maintain the appropriate temperature inside the house.

2. Thermal comfort: Better thermal insulation means fewer cold areas near windows in winter and fewer “hot spots” in summer. Our houses are more pleasant to stay in, regardless of the weather conditions outside.

3. Environmental protection: Reducing energy consumption in our homes contributes to lower emissions greenhouse gas emissions, which is an essential element in the fight against climate change.

4. Long-Term Savings: Investing in low U-value windows may seem expensive. However, it saves you a lot on your energy bill. In addition, many governments offer financial incentives for people investing in the energy efficiency of their homes.

Electrical strip photo

In conclusion, we encourage everyone to think about the thermal transmittance of windows if you care about your home’s energy efficiency. It is worth investing in quality that will bring us both economic and ecological benefits.


It is important to remember that our choices affect the environment, and caring for the environment begins with our homes. Responsible investments in energy efficiency are the key to building a better future for us, our families, and future generations.


We encourage you to share your experiences and reflections on this topic. Together we can make positive change!



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