If your car gets very hot in the sun, window tint can help. A good film can stop part of the sun’s heat before it enters through the glass. A good window film can reduce part of that heat. But all window tint is not the same. A dark film is not always the best film for heat. More important is the amount of material and the heat rejection capacity of the film. Then, does window tint that keeps your car cooler? It surely does, but the issue lies in determining the amount of heat rejection.
This guide will show how window tints work, the meaning behind heat numbers, and what things need to be considered when selecting your film.
Does Window Tint That Keeps Your Car Cooler?
Yes. The appropriate window tint that keeps car cooler can limit the amount of heat from the sun that gets into the car via the windows. Sunlight contains energy. As these rays enter the car through its windows, some energy from the rays comes into the car interior. This energy is absorbed by the seats, the dashboard, the steering wheel, etc. Therefore, the car becomes extremely hot.
Window film can block or reject part of this solar energy. A good heat-rejection film can also reduce infrared energy, which is a part of the sun’s energy that you feel as heat. Tint does not make cold air by itself. It also cannot stop every bit of heat from entering your car. It simply reduces some of the heat that comes through the glass. This is why the type of film used is important when you need window tint for heat reduction.
How Does Window Tint Reduce Heat?
Car window film can tackle sunlight in many different ways. The exact result depends on the film material and its design. One important part is solar energy. A film with a high Total Solar Energy Rejection, or TSER, can reject a larger part of the sun’s energy. Infrared rejection also matters. Infrared energy is part of the sunlight that can add heat to the cabin. Some films use special materials to reduce this energy.
The film can also reduce glare. This does not directly cool the car, but it can make bright sunlight less harsh for your eyes. UV protection is another part of good window film. UV rays may damage the inside of your car. Films that have quality can block almost all of the UV rays; however, UV rejection does not mean that it is heat rejection. That is why, when you choose films, consider something else other than their darkness.
Window Tint Heat Test: How Much Cooler Can a Car Get?
People often want one simple answer, such as “this tint makes your car 20 degrees cooler.” Real tests do not always work that way. A proper heat test needs the same car, same glass, same weather, same test time, and the same measuring method. One window can also receive more direct sunlight than another.
A basic test can compare untreated glass with glass that has different films. A temperature meter can measure the heat behind each sample after the samples sit under the same light source. The result can show which film blocks more heat under that test. But it does not necessarily imply that each car will receive the same outcome.
For instance, a car having a big windshield will be very hot despite having tinted films on its side windows. The roof and body also take in heat. This is why filmmakers usually give technical numbers such as TSER and infrared rejection. These numbers give a more useful way to compare film performance than one simple cabin temperature test.
For example, TERMINAX lists a 72% TSER for some UltraCrystal-X™ and Ceramic-X™ IR shades. Its 15% UltraCrystal-X™ shade lists 72% TSER and 74% infrared energy rejection. Ceramic-X™ IR at 5% VLT also lists 72% TSER, with 70% infrared energy rejection.
These are film performance measurements. These should not be seen as guarantees for achieving 72% cooling in your car cabin.
Which Type of Window Tint Keeps a Car Cooler?
Different films give different levels of heat control.
Dyed Window Tint
Dyed film uses dye to give the glass a darker look. It can reduce glare and some solar heat. It is often chosen when the main goal is a darker appearance and basic privacy. However, it will most probably not provide the same high performance as a high-performance ceramic film. If thermal insulation is your priority, then avoid going for a film just because it appears dark.
Carbon Window Tint
Carbon film can offer better heat control than many basic dyed films. It also gives the glass a dark and clean look. It sits between basic films and some higher-end heat-rejection films. The actual result depends on the film brand and its technical rating.
Ceramic Window Tint
Ceramic film uses ceramic materials to control heat and light. Many ceramic films focus on infrared rejection while keeping good visibility. This can help you get strong heat control without using an extremely dark shade. For people who want heat rejection car tint, ceramic film is one option worth comparing.
Does Darker Window Tint Block More Heat?
Not always. A darker film blocks more visible light, but visible darkness does not tell you the full heat performance of the film.
For example, TERMINAX Ceramic-X™ IR has different shades. Its 5% VLT version lists 72% TSER, while its 70% VLT version lists 49% TSER. The darker film has a higher TSER in this range, but other films can show very different results.
UltraCrystal-X™ also shows why you should check the numbers. Its 15% VLT version lists 72% TSER, while the 90% VLT version lists 24% TSER.
The main point is simple: darkness and heat rejection are not the same thing. A lighter high-performance film can reject a good amount of heat. A dark basic film may not give the same result.
Window Tint for Heat Reduction: What Numbers Matter?
A film data sheet can look confusing at first. A few numbers are more useful than others when your main goal is less heat.
TSER
TSER means Total Solar Energy Rejected. It tells you how much of the sun’s total energy the film rejects. A higher TSER usually means the film rejects more total solar energy. This is one of the most useful numbers to check when your main goal is a cooler cabin.
Infrared Rejection
Infrared rejection tells you how much infrared energy the film can reduce under the maker’s test method. A high infrared number can be useful when you want better heat control. But do not use this number alone. Check TSER too.
UV Rejection
UV rejection shows how much ultraviolet energy the film blocks. Many good automotive films can block 99% or more UV. It offers protection to the inner part of the car and those who are using it, but rejection of UV rays does not mean heat rejection.
VLT
VLT stands for Visible Light Transmission. It is the amount of light that can go through the glass and film. A lower VLT means a darker window. VLT helps you understand the look of the film. But it doesn’t tell you how hot it really is.
Do Tinted Windows Keep Your Car Cooler When Parked?
Certainly, they can assist you if your car is directly exposed to the sun. A car can be very hot because of the direct entry of sunlight into the cabin of the car. In addition, the dashboard and seats of a car have the capacity to retain heat for quite some time. The heat rejection coating reduces some of the solar energy entering through the windows.
The windshield matters a lot because it is usually a large piece of glass. Side and rear windows also add to the total heat that enters the cabin. The tint cannot be the only way to keep the car cool while it is stationary. It is possible for heat to get inside via the roof, body, and other places. The use of the windshield sunshade would provide an extra layer of protection to the car if parked for long periods outdoors.
Beat the Heat Window Tinting: Does It Help While Driving?
Tinting is also beneficial in cases where driving in bright sunlight occurs. The sunlight may get into your arms, face, seats, and dashboard through the side glass. A good film can help absorb some of the energy from the sun that enters the cabin through the windows. It will be of great help when the sun’s rays hit one side of the vehicle.
The effect changes during the day. The sun may hit the driver’s side in the morning and the other side later. That is why beat the heat window tinting should be concentrated on the heat properties of the film rather than on its color. A dark window will reduce light; however, a high-performance light film can do well in heat reduction too.
Does Window Tint Help the Air Conditioner Work Better?
Window tint does not increase the power of your AC. Your AC system still has the same parts and the same cooling capacity. However, there could be less heat to remove from the car interior as well since fewer solar rays enter through the windows. This could simplify cooling of the car interior after being exposed to the sun.
The result depends on the weather and the vehicle. A car parked outside in very strong sun will have a much bigger heat load than a car parked in the shade. Tint also cannot fix a weak AC system. If the AC gives warm air, it could be a mechanical issue requiring fixing.
What Affects Car Window Heat Rejection?
Your film is only one part of the result. The type of glass matters. Some factory glass already has a tint or coating. The total glass and film combination can change the final result. The size of the windows also matters. A car with a large glass roof or large windshield can receive more sunlight than a car with less glass.
Outside temperature matters too. A car parked in strong summer sun will face a much bigger heat load than one parked on a cool day. The car’s interior can also affect how hot it feels. Dark seats and dashboards can absorb a lot of solar energy. Improper installation might result in some defects like bubbles and spaces that might influence the end performance of the film.
Best Window Tint for Heat Reduction
It all depends on what your preference is from the film. If heat is your main concern, check the film’s actual heat data. Look at TSER and infrared rejection. Then check the shade, visibility, warranty, and local rules. Ceramic films often suit drivers who want strong heat control without very dark glass. Other film types can also work well when their test data meets your needs.
TERMINAX Window Film Options for Heat Reduction
TERMINAX has several automotive window films with different heat-rejection levels. The important part is to compare the technical data for the shade you choose.
UltraCrystal-X™ Window Film uses a thousand-layer optical structure and offers several VLT choices. Its listed TSER ranges from 72% at 15% VLT to 24% at 90% VLT. Its 15% shade lists 74% infrared energy rejection and more than 99% selective infrared reduction.
Ceramic-X™ IR Window Film uses an IR-blocking layer. Its listed TSER ranges from 72% at 5% VLT to 49% at 70% VLT. The range also lists 69–71% infrared energy rejection across several shades.
Ceramic IR Window Film uses a charcoal tone and comes in several shades. Its listed TSER ranges from 66% at 8% VLT to 42% at 76% VLT. The listed infrared energy rejection ranges from 56% to 64%, depending on the shade.
X-Dyed Window Film is another option in the TERMINAX window film range. Its listed TSER ranges from 63% at 6% VLT to 28% at 71% VLT. The page also lists at least 99% UV rejection across its shades.
These numbers show why you should check the exact shade before you choose a film. The same product range can have different heat results at different VLT levels.
How to Choose Window Tinting to Reduce Heat
If you are thinking about window tinting to reduce heat, then consider more than just the color of the film. Also ask the installer for the film’s technical sheet. A good installer should be able to tell you what the numbers mean. A very dark film may look cool, but it is not automatically the best choice for heat control.
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Check the TSER number.
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Check the infrared rejection.
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Check UV protection.
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Compare films at similar VLT levels.
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Ask about the film warranty.
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Use a skilled installer.
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Check your local tint rules before installation.
Can Window Tint Completely Stop Car Heat?
No window film can stop all heat. The sun can still heat the roof and body of the car. Some sunlight can also enter through areas that do not have film. Window film mainly helps by reducing solar energy that enters through the glass.
That means you should see tint as one part of heat control. Shade parking, use of a sun shade on the windshield, maintaining the AC unit in optimal shape, and minimizing sun exposure also help.
Final Thoughts
Therefore, does window tint that keep your car cooler? Yes, it does. The right film can block the sun’s energy from coming into your car via the windows. Remember that the darkest film is not necessarily the best option. Consider the TSER and the infrared rejection before settling for any film. It is important to note the shade of the film as well.
A proper heat test will enable you to gauge the performance of various films under similar conditions, but then again, your car will respond differently due to the variation of temperature levels in your car depending on the weather, glass, design of your vehicle, and sun rays. If heat is your problem, select a film based on its heat statistics.
Frequently Asked Questions About Window Tint That Keep Your Car Cooler
Does window tint really keep a car cooler?
Absolutely. A good window film can keep away some of the solar energy that passes through the window. The effectiveness of the cooling depends on many factors.
What is the best window tint for heat reduction?
High-performance ceramic films will offer good heat rejection. Look at TSER and infrared rejection rather than simply picking a dark-looking film.
Does darker window tint block more heat?
Not always. A darker film may reject more solar energy, but darkness alone does not show heat performance. It is important to consider the technical specifications of the film.
How much cooler can window tint make a car?
There is no one figure for all cars. Test results depend on the film used, the glass, weather conditions, sun, car design, and testing procedure.
Does ceramic window tint reduce more heat than regular tint?
Many ceramic films offer excellent heat rejection from infrared and solar radiation. This outcome depends upon the type of product, shade, glass, and performance thereof.
Do Tinted Windows Keep Car Cooler?
Yes, tinted windows will help minimize the sun’s rays from coming into the car. Using a heat-rejecting window film will make you comfortable inside the car during summer days.