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A thermal curtain works by creating a still layer of air between the fabric and the glass. It is this layer of air, not the fabric alone, that forms the insulating barrier. For this air layer to stay still, the curtain must cover the window perfectly: no gaps at the top, at the bottom, or on the sides.
A standard-size curtain always leaves spaces around the window. Cold air seeps in through these openings and cuts insulation by 30 to 50%. A made-to-measure thermal curtain, configured to the exact dimensions of your window, eliminates these thermal bridges and maximizes the temperature gain.
To combine thermal insulation with total blackout (100%), explore the made-to-measure blackout thermal curtain collection, two levels of performance in the same 620 g/m² fabric.
Kurtens curtain features and performance
| Feature | Kurtens 3-in-1 curtain |
|---|---|
| Construction | 3 layers |
| Fabric weight | 620 g/m² |
| Thermal performance | Thermal difference of up to 7 °C, measured in a laboratory* |
| Blackout | Opaque fabric that blocks out light when the curtain is closed |
| Fitting | Eyelets, heading tape or rod pocket |
| Dimensions | Configure on the product page to suit your installation |
*Result obtained under test conditions. Performance in use depends on the window, room and installation.
| Criterion | What to compare | Kurtens | Choosing your curtain | What to check |
|---|---|---|---|---|
| Construction and fabric weight | The curtain layers and fabric weight per m² | 3 layers · 620 g/m² | Compare the construction, not just the weight | Fabric weight alone does not indicate a gain in °C or dB |
| Thermal performance | The measured result and test conditions | Up to 7 °C* | Compare measurements taken under comparable conditions | The test setup and measurement points |
| Blackout | Light passing through when the curtain is closed | Opaque 3-in-1 range | Choose according to your need for darkness | Do not confuse opaque curtains with light-filtering curtains |
| Dimensions and fitting | The area to cover and the intended fitting | Choice of colour, fitting and dimensions | Prepare your measurements before configuring | The final dimensions and support compatibility |
Double glazing works around the clock, day and night, with the openings closed. The thermal curtain steps in where the glazing alone is not enough: at night when temperatures drop, on weekends and during absences, and in summer to block direct sunlight.
The two solutions are complementary. A home with double glazing and Kurtens thermal curtains combines the benefits of both: the glazing handles the constant exchange, the curtain reinforces insulation at critical moments.
What the curtain adds on top of double glazing:
- A still layer of air trapped between the fabric and the glazing, naturally insulating
- A block against summer sun rays that the glazing alone cannot provide
- Partial soundproofing to complement the thermal insulation
To go further, read our complete guide to choosing a thermal curtain or our thermal curtain vs double glazing comparison.
Contrary to a common belief, the thermal curtain is not only a winter solution. Its effectiveness works two ways depending on the season.
Winter: the high-density fabric creates a barrier against the cold air radiating from the glazing. Hung floor to ceiling, it stops convection.
Summer: closed during the day on a sun-facing window, it helps limit room overheating. Close the curtain when the window is exposed to the sun to reduce direct sunlight indoors. Its effectiveness depends on the glazing, exposure and installation.
A thermal curtain loses a significant part of its efficiency if the dimensions aren't right. Thermal bridges form exactly where the fabric doesn't cover:
- The side gap: cold air slips in through the uncovered edges
- The floor gap: natural convection circulates cold air under the curtain
- The insufficient width: the window edges stay exposed
At Kurtens, our standard sizes are designed to cover the most common windows with the recommended thermal overlaps. For an unusual window, the made-to-measure option lets you enter your exact dimensions: 15 to 20 cm overlap on each side, an adjusted floor-length drop and a height configured for your ceiling. The thermal difference of up to 7 °C is measured in a laboratory; installation alone does not guarantee this result in every home.
Need help measuring? See our size guide. For large windows, explore our made-to-measure wide-width collection.
*Under optimal installation and test conditions.
Frequently asked questions.
Does a thermal curtain really make a difference?
The Kurtens curtain achieves a thermal difference of up to 7 °C, measured in a laboratory. This test result does not guarantee a temperature gain in every home: performance in use depends on the window, room and installation.
What's the difference between a thermal curtain and an insulating curtain?
When we talk about thermal insulation, both terms describe the same function: limiting heat exchange through the windows. A thermal curtain is an insulating (thermal) curtain; the distinction is semantic, not technical.
Is a thermal curtain effective against heat in summer?
Yes. In summer, a thermal curtain closed in front of a sun-exposed window helps limit room overheating. Its opaque fabric reduces direct sunlight indoors. The result depends on the glazing, exposure and installation.
Should a thermal curtain touch the floor?
Ideally yes. A 2 to 3 cm drop onto the floor eliminates the low thermal bridge through which cold air seeps in. That's why it's important to choose the right size, or to opt for made-to-measure if your height is unusual.
Is a thermal curtain also soundproof?
The Kurtens 3-in-1 curtain combines thermal, acoustic and blackout functions. It is opaque: when closed, it blocks out light.
What temperature gain do you get with a thermal curtain?
The Kurtens curtain achieves a thermal difference of up to 7 °C, measured in a laboratory. This result relates to the test conditions and does not guarantee a temperature gain throughout the room.
Which curtain blocks the cold?
A high-density thermal curtain with an insulating lining is a very effective solution for blocking cold at windows. Kurtens curtains offer a thermal difference of up to 7 °C, measured in a laboratory, combined with 100%* blackout and 22 dB* sound attenuation, made to your window dimensions.
*Data from tests conducted under optimal test conditions.
How do you install thermal curtains correctly?
For maximum insulation, follow these principles: mount the rod as high as possible above the window (ideally at the ceiling), extend the curtain beyond the window frame on each side (10 to 15 cm minimum), make sure the curtain touches the floor or comes as close as possible depending on the drop you want, and close the curtain completely at night. During the day, open the curtains on sun-facing windows to benefit from the solar gain.
Is a made-to-measure thermal curtain more effective than a standard-size curtain?
Yes. A standard-size curtain leaves gaps around the window through which cold air seeps in. These leaks cut insulation by 30 to 50%. A made-to-measure curtain, configured to the exact dimensions of your window, eliminates these thermal bridges. That's the difference between a curtain that "decorates" and a curtain that truly insulates.
How much does a Kurtens thermal curtain weigh?
The Kurtens fabric has a density of 620 g/m2. A 150 x 230 cm panel weighs around 2.1 kg. A 300 x 270 cm panel weighs around 5 kg. This high weight is what gives the curtain its insulation performance. Plan for a sturdy rod with a minimum diameter of 28 mm and fixings suited to your wall type.
