The summer heat makes the car interior turn into a hot oven, and in winter, icy windows become a real headache. Athermal glazing is one of the solutions that promises to make travel more comfortable at any time of the year. But what is it really? How does it work, what types are there, and is it worth overpaying for such an option when buying a car or installing new windows?
Many car owners have heard about athermal windows, but not everyone understands their fundamental difference from regular or tinted ones. In this article we will analyze the physics of the process, compare the pros and cons, talk about myths and give practical advice on choosing. We’ll also answer a question that worries many: “Is it possible to stick athermal film on my own and will there be an effect?”
Spoiler: there will be an effect, but not always as the sellers promise. Let's look into it in detail.
What is athermal glazing and how does it work?
Term "athermal glazing" comes from Greek "a-" (denial) and "therme" (warmth). That is literally - "not allowing heat to pass through". In the automotive industry, this means glass that selectively reflects or absorbs infrared (IR) and ultraviolet (UV) radiation without impairing driver visibility.
Unlike ordinary glass, which allows up to 80-90% solar energy, athermal delays until 50-70% heat. This is achieved through:
- 🔬 Multilayer structure — a metallized film (usually based on silver, titanium or indium oxides) is applied between the layers of glass.
- 🧪 Additives to glass mass — during production, special pigments are introduced into glass that absorb infrared rays.
- 🎨 Tinting coating — some athermal glasses have a slight greenish or bluish tint, but this is not their main property.
It is important to understand: athermal glass ≠ tinting. Tinting simply darkens the interior, reducing visibility, and athermal glass works at the level of physics - it reflects heat rays without changing transparency. For example, glass with markings Green Tint from Saint-Gobain Sekurit has a barely noticeable green tint, but delays until 60% heat.
Interesting fact: the first athermal glasses appeared in 1980s on premium cars Mercedes-Benz and BMW. Today they are installed even on budget models, for example, Lada Vesta or Kia Rio in top trim levels.
Types of athermal glass: what the market offers in 2026
Not all athermal glass is created equal. They can be classified according to several criteria:
- According to production technology:
- 🔧 Laminated — two layers of glass are glued together with a film with a metallized coating (used for windshields).
- 🧊 Tempered — single-layer, with an athermal coating applied to the surface (usually side and rear windows).
- By level of protection:
- 🌡️ Standard - detain 30-50% heat (for example Pilkington Kool Lite).
- ❄️ Reinforced - up to 70% (for example, Guardian ClimaGuard).
- 🟢 Green (Green Tint) - the most common.
- 🔵 Blue (Blue Tint) - often from premium brands.
- ⚪ Colorless - maximum transparency, but lower thermal protection.
The most popular brands on the Russian market in 2026:
| Brand | Glass model | Heat retention, % | UV delay, % | Price (frontal), ₽ |
|---|---|---|---|---|
| Saint-Gobain Sekurit | Cool-Lite Xtreme | 65 | 99 | 22 000–28 000 |
| Pilkington | Kool Lite Solar | 50 | 95 | 18 000–24 000 |
| Guardian | ClimaGuard Premium | 70 | 99 | 25 000–35 000 |
| AGC | Interpane iplus | 55 | 98 | 20 000–26 000 |
An important nuance: glasses with heat retention of more than 60% often have a noticeable color tint, which can distort the perception of colors (for example, a red traffic light will appear orange). Check it out with a sample before purchasing!
If you often drive at night, choose glass with minimal light absorption (no more than 15%). Otherwise, the headlights of oncoming cars will dazzle more.
The advantages of athermal glazing: why it is not a luxury, but a necessity
The main advantage of athermal glass is reduction in interior temperature by 5–10°C in hot weather. But this is not the only plus. Let's consider all the advantages in detail:
- ☀️ UV protection - up to 99% ultraviolet radiation does not penetrate into the cabin. This means that the plastic panels will not fade, the skin of your hands will not be damaged, and you will be able to use sunglasses less often.
- ❄️ Less condensation in winter — slower glass heats up and cools down, so fogging occurs less frequently.
- 🔋 Fuel economy — the air conditioner turns on less frequently, which reduces the load on the engine (according to AAA, on 5-7% in the urban cycle).
- 🚗 Security — in the event of an accident, laminated athermal glass does not shatter into fragments, but is held on to the film.
- 💰 Durability - factory athermal glass serves the entire life of the machine, unlike tint films, which fade in 3–5 years.
The effect is especially noticeable in regions with hot climates (for example, Krasnodar region or Stavropol region), where the temperature in the cabin without protection can reach 60–70°C. With athermal glass this figure drops to 45–50°C — the difference is noticeable within 5 minutes after opening the door.
Another unobvious bonus: less load on the climate control system. For example, in Toyota Camry with athermal glazing, the air conditioner is switched on 20% less oftenthan in the same model with conventional glass (data from dealerships).
Athermal glass does not replace tinting, but reduces the need for it. In some cases, you can do without film if the glass blocks enough light.
Disadvantages and limitations: why athermal glazing is not suitable for everyone
Despite the obvious advantages, athermal glass also has disadvantages. The main one is price. Factory athermal windshield for Volkswagen Polo will cost 25 000–30 000 ₽, whereas the usual one is in 12 000–15 000 ₽. The difference is almost 2 times!
Other cons:
- 🔍 Color distortion - glass with a high degree of protection (more than 60%) can give surrounding objects a greenish or bluish tint.
- 📱 Communication problems — metallized coating can degrade GPS and mobile network signals (especially noticeable in Moscow City or other areas with poor coverage).
- 🔧 Difficulty of replacement — not all car repair shops undertake the installation of athermal glass due to the risk of damage to the coating.
- 🚫 Incompatible with some sensors - for example, cameras Tesla Autopilot or radars Bosch may not work correctly.
⚠️ Attention: If your machine is equipped with HUD (Head-Up Display), check with the glass manufacturer to see if they are compatible. Some athermal coatings distort the projection.
One more point - efficiency depends on the glass area. In hatchbacks or crossovers (for example, Hyundai Tucson) with a large glass area, the difference will be more noticeable than in sedans with compact side windows.
Athermal film vs factory glass: which is better?
Many car owners ask: “Is it possible to achieve the same effect by gluing athermal film onto ordinary glass?” Answer: partly yes, but there are nuances.
Let's compare two options:
| Criterion | Factory athermal glass | Athermal film |
|---|---|---|
| Heat retention, % | 50–70 | 30–50 |
| Service life | 10+ years | 3–7 years |
| Cost (windshield) | 20 000–35 000 ₽ | 5 000–12 000 ₽ |
| Impact on communications | May worsen | Minimum |
| Difficulty of installation | Requires professionals | You can stick it yourself |
Film is cheaper, but it has serious disadvantages:
- 📉 Transparency decreases - even “transparent” films reduce light transmission by 5-10%.
- 🌡️ Less efficient — maximum heat retention of films — 50%, while for glass - up to 70%.
- 🔥 Risk of peeling — if the sticker is applied incorrectly or due to temperature changes, the film may bubble.
⚠️ Attention: Films with a metallized layer (for example, LLumar ATR) can block signals from contactless keys and alarm key fobs. Please check compatibility before purchasing!
If budget is limited, film is a reasonable compromise. But for maximum effect it is better to choose factory athermal glass.
Stick only on clean glass (no scratches)
Choose a film with a guarantee of at least 5 years
Check the light transmittance certificate (not lower than 70% for the windshield)
Avoid metallized films if the car has a proximity key -->
How to check if your car has athermal glass
Not all automakers honestly indicate the presence of athermal glazing in their specifications. Here 4 ways to check it yourself:
-
View labeling — most glasses have a label with information in the lower corner. Look for the inscriptions:
TINTEDorGREEN TINT- light tinting, but not always athermal.ATHERMAL,SOLAR,CLIMA- a clear sign.UV CUTorIR CUT— protection from ultraviolet/infrared rays.
Use a UV flashlight — bring it to the glass in a dark room. If almost no light comes through from the back side, the glass is athermal.
Check heating — on a sunny day, touch regular and supposed athermal glass. The temperature difference will be 10–15°C.
Contact your dealer — use the VIN code to determine which glass is installed on your model.
For example, on Skoda Octavia 2020+ included Style athermal glass comes by default, and in Ambition - only frontal. U Renault Duster Even in the top there is no athermal glass - only tinting.
How to decipher glass markings?
The first letter is the manufacturer (E - Europe, DOT - USA, J - Japan).
The numbers after the letter are the plant code.
Designations like “AS1” or “M1” indicate the type of glass (laminated/tempered).
The inscriptions "TUV" or "ECE R43" - certification according to European standards.
Is it worth installing athermal glass: calculation of payback
Let's calculate how quickly the installation of athermal glass will pay off. Let's take for example Hyundai Creta with a mileage of 50,000 km and regular glass.
Initial data:
- Cost of a set of athermal glass (windshield + 4 side) — 80 000 ₽.
- Fuel savings due to less frequent air conditioning - 5% (with a mileage of 20,000 km/year and a consumption of 8 l/100 km).
- Reduced wear and tear on the interior (plastic, leather seats) - savings 10 000 ₽ per year during recovery.
- Reduced risk of overheating of electronics (e.g. navigation) - prevented repairs on 15 000 ₽ once every 3 years.
Calculation:
| Saving item | Annual savings, ₽ |
|---|---|
| Fuel (5% of RUB 120,000 for gasoline) | 6 000 |
| Interior safety | 10 000 |
| Electronics protection (every 3 years) | 5 000 |
| Total per year | 21 000 |
Under such conditions payback - 3.8 years. If you plan to drive your car longer, installing athermal windows is economically justified. For new cars (eg Kia Seltos 2026) payback period increases to 5-6 years, but you get comfort from the first day.
⚠️ Attention: If you sell your car in 2-3 years, athermal glass is unlikely to increase its value on the secondary market. But they can become a powerful argument for the buyer.
FAQ: Answers to frequently asked questions about athermal glazing
Is it possible to install athermal glass instead of regular glass on any car?
Yes, but there are nuances:
- For the windshield, you need to select a model with the same curve and mounts for the wipers and mirrors.
- The side windows must match the size and lift mechanism (if there is one).
- For some models (for example, Tesla Model 3) athermal glass is not certified - this may void the warranty.
It is better to contact specialized services that work with a specific car brand.
Is it true that athermal glass transmits heat from the stove worse in winter?
No, it's a myth. Athermal glasses delay infrared radiation (heat from the sun), but do not affect the convection heat from the stove. Moreover, they cool down more slowly, so the interior retains heat longer when the engine is off.
Is it possible to stick athermal film over factory athermal glass?
Technically possible, but efficiency will not work out. For example, if glass retains 50% of heat, and film - 30%, together they will not give 80%, but a maximum of 65%. In this case, transparency will deteriorate noticeably. It's better to choose one thing.
Does athermal glass affect the operation of radars and cameras?
Yes, some metallic coatings may interfere with:
- Radar cruise control (eg Bosch MRR).
- 360° cameras (system Around View Monitor at Nissan).
- Rain and light sensors.
Before installation, check with the glass manufacturer for compatibility with your model.
Which cars come from the factory with athermal glazing?
In 2026, athermal glass will be installed as standard or optionally on:
- Volkswagen Tiguan (all configurations)
- Toyota Camry (except basic)
- Skoda Kodiaq (Style and Laurin & Klement)
- Hyundai Santa Fe (Comfort and higher)
- Lada Vesta NG (Luxe)
European brands (Mercedes, BMW, Audi) athermal glass comes in almost all trim levels.