Guide pratique : comment reconnaître un rideau thermique efficace ? - NOKOMIS

Practical guide: how to recognize an effective thermal curtain?

Made from insulating materials, thermal curtains are accessories designed to improve insulation and comfort in a home. In addition to blocking heat in summer, they reduce heat loss in winter. These devices contribute to both maintaining a constant indoor temperature and reducing the energy bill. However, their performance varies depending on the fabric and manufacturing method. So, how do you know if a curtain is thermal? Follow our advice.

Materials and composition

Materials typically used for thermal curtains

The thermal insulating curtain is made from different materials:

  • insulating fabrics : among the most used, we find polyester, velvet, wool and thick cotton. They can block drafts, light and cold in winter;
  • thermal linings : some curtains have a thermal lining made of insulating material such as fleece to reinforce insulation;
  • fabric blends : other curtain models are made from a blend of fabrics to maximize their thermal performance and for a more aesthetic look.

How do these materials contribute to insulation?

These materials contribute to thermal insulation in several ways. First of all, insulating fabrics have low thermal conductivity . They are particularly effective against temperature variations, because they do not let cold or heat spread through them. As a result, they act as a thermal barrier . Furthermore, insulating materials are known for their ability to retain and absorb heat. This contributes to the energy efficiency of a home. Note that the thicker the material, the more effective the polar or aluminum thermal curtain is. Finally, insulating materials reflect heat. They can prevent the sun's rays and extreme heat from entering the house. So you will always enjoy a pleasant temperature in summer.

Design and manufacturing

The design features that distinguish a thermal curtain

Insulation curtains are distinguished by their design features:


As stated previously, thermal curtains are very thick . This additional layer of fabric allows them to create a significant thermal barrier and reduce heat transfer.

The density

The density of a thermal curtain refers to its thickness. The higher it is, the thicker the curtain and the more efficient it is. Density should be considered along with other design features to test curtain action.

Surface treatment

Some insulating curtains benefit from a surface treatment. This may include an anti-stain or anti-scratch treatment, an anti-static treatment or waterproofing. They can also be covered with insulating or reflective coatings.

Ease of installation

Thermal curtains are generally designed to be easy to install . This will allow users to quickly fix and adjust them.

Examples of manufacturing techniques that improve thermal efficiency

Are you wondering how to tell if a curtain is thermal? Please note that several techniques can be used to increase their effectiveness. We can cite :

  • the pleated design : thanks to the additional layers or pleats used, the thickness of the thermal blackout curtain increases, as does its insulating power;
  • sealed seams : they reduce the spaces through which air escapes, which helps combat drafts;
  • the use of high-quality fabrics : special fabrics with low thermal conductivity can significantly improve the performance of thermal insulating curtains.

Performance and certification

Performance standards for thermal curtains

Several indicators are used to test the performance of thermal curtains:

The thermal insulation coefficient

It represents the ability of a material to transmit heat. A low thermal insulation coefficient indicates better insulation.

Thermal resistance

This index represents the ability of a material to diffuse heat. The higher the thermal resistance , the more efficient the insulation.

Solar reflectance

It measures the curtain's ability to reflect sunlight.

UV ray blocking rate

This rate indicates the curtain's ability to block solar rays.

The solar absorption coefficient

This value expresses the proportion of heat absorbed by the thermal curtain.

How to identify certifications and quality labels?

Thermal curtains must comply with energy efficiency standards . Among the labels and certifications used for these accessories, we find the OEKO – TEX Standard 100 label, ISO 9001 and ISO 14001 . So, how do you know if a curtain is thermal? To do this, start by checking the presence of these labels on the label. Next, check the manufacturer's website. You will certainly find information on certifications there. Check the curtain specifications or FAQ section. You can also look for symbols or logos on the packaging. Finally, don't forget to read user reviews and reviews to assess the quality of the thermal curtain you are interested in. Pay attention to comments on labels.

Practical tests and assessments

To answer the question: how to know if a curtain is thermal, it is possible to carry out practical tests and evaluations .

Tips for testing the effectiveness of a thermal curtain at home

If you want to know the effectiveness of your thermal curtain, you can use a few techniques:

The flame test

Light a candle and hold it near the curtains. If the flame is drawn towards the window, it means that the windows are not completely blocking drafts.

The light test

During the day, close your curtains completely, then turn off all lighting sources. If the outside light is well filtered, this shows that the curtains do not let heat through.

Subjective sensations

Stand near your windows when the curtains are closed. If you experience little or no drafts and the temperature inside the house is ambient, this indicates an improvement in thermal efficiency.

Measuring temperature differences

Using a thermometer, measure the temperature difference in your home before and after installing the curtains. If they are efficient, you will notice a reduction in temperature differences.

Importance of evaluation depending on the context of use

The evaluation of a thermal insulating curtain must always take into account the context of use . Indeed, depending on the orientation of the windows, the curtains can be exposed to different climatic conditions. Therefore, you will not necessarily reach the same conclusion for the same test carried out on two curtains placed in two different locations. Furthermore, take the season into account, because during winter, drafts can be very strong. Likewise, consider the type of window, as a double or triple glazed window greatly influences the amount of heat lost or gained. By considering these elements, your tests will be carried out with complete objectivity.

For quality thermal curtains, trust Nokomis

To optimize your comfort and save energy, install quality insulating curtains in front of your windows. We have several models of curtains with astonishing properties to meet your expectations. Whether you want to improve thermal insulation, sound insulation or both, you will find suitable solutions on our Nokomis website. Thanks to their elegant materials, our curtains will also add a touch of elegance to your interior decoration.

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