Clear window film can help reduce solar heat without making a room feel dark, but the products differ in coverage, installation demands, and how much heat-rejection information they provide. Our picks include a small 3M sheet with a stated heat-rejection figure and two larger Buydecorativefilm rolls. Compare the listed specifications with your window size and installation comfort before choosing.
Quick Comparison
| Product | Size | Key details | Best for |
|---|---|---|---|
| 3M Sun Control Window Film Solar Clear | 3′ x 5′ | Up to 97% heat rejection in the 800–1000 nm range; blocks 99.9% of UV rays | A small project where a stated heat-rejection figure matters |
| BDF NSN70 Transparent Heat Rejection Film | 60 in x 25 ft | Very light shade; blocks 99% of UV rays; includes tools and an installation guide | Covering multiple or wider windows |
| BDF NSH70 Heat Control Film | 36 in x 7 ft | Very light shade; blocks 99% of UV rays; includes tools and an installation guide | A smaller project that needs more than one short panel |
Our Picks: Best Clear Window Film For Heat Reduction reviews
3M Sun Control Window Film Solar Clear: A Compact Sheet With a Stated Heat-Rejection Figure
This 3M film comes as one 3-by-5-foot sheet for interior home windows. The listed coverage is one to three windows, depending on their size, so measure each pane before you buy. Its compact format may suit a targeted project better than a whole-home installation.
The product description states up to 97% heat rejection, measured from 800 to 1000 nm. That figure applies to the specified wavelength range, so it should not be read as a promise to reject 97% of all solar heat. The film also blocks 99.9% of UV rays, which can help protect furnishings from fading.
3M describes the film as clear, with low reflectivity to reduce the mirror-like look some films can create. It is intended to preserve views without a dark appearance. The film is described as permanent yet removable as needed, and the listing recommends using the 3M Sun Control Window Film Install Kit. Take care during installation: a small sheet leaves less room to work around mistakes than a large roll.
Compared with the BDF options, this is the only pick with a specific heat-rejection figure in the supplied details. Its main trade-off is limited coverage: the BDF rolls offer much more material for larger projects.
Pros:
- Lists up to 97% heat rejection for the 800–1000 nm range
- Blocks 99.9% of UV rays
- Designed for clear views and low reflectivity
- Small sheet may be practical for a limited project
Cons:
- Less coverage than either BDF roll
- The listed heat-rejection figure applies to a specific wavelength range
Verdict: Choose the 3M sheet if you need a compact amount of film and value its clearly stated heat and UV specifications.
BDF NSN70 Transparent Heat Rejection Film: A Wide Roll for Larger Projects
The BDF NSN70 comes in a 60-inch-wide, 25-foot-long roll, offering substantially more material than the other options here. Its very light shade is intended to let plenty of natural light through while helping control heat. The product details describe it as durable and scratch resistant, though they do not provide a specific heat-rejection percentage.
The film blocks 99% of UV rays, which may help reduce sun-related fading on furnishings. A strong adhesive is protected by a release liner. The listing recommends using plenty of soap-and-water mixture on both the adhesive side and the window during installation, and it includes tools and an installation guide.
The broad roll can make sense when you have several panes or wide windows to cover. However, handling a long sheet takes care. The product information warns that the film is sensitive and that a fold can leave a permanent wrinkle. Clean the glass thoroughly and clear it of blemishes before applying the film; flaws or debris under the film can affect the finished look.
Compared with the 3M sheet, the NSN70 gives you far more coverage and a lower stated UV-blocking figure, but its supplied details do not include a numerical heat-rejection result. The smaller BDF NSH70 shares the very-light-shade and UV-blocking claims, but has a narrower, shorter roll.
Pros:
- Wide, long roll for larger or multiple windows
- Very light shade lets plenty of light through
- Blocks 99% of UV rays
- Includes tools and an installation guide
Cons:
- Supplied details do not state a numerical heat-rejection percentage
- Folding can cause a permanent wrinkle, so careful handling is important
Verdict: Pick the BDF NSN70 if you need broad coverage and are comfortable carefully handling a large, adhesive film sheet.
BDF NSH70 Heat Control Film: A Shorter Roll for Smaller Areas
The BDF NSH70 is a 36-inch-wide, 7-foot-long film roll. Its very light shade is designed to allow plenty of light through while helping manage heat. The product description also says it blocks 99% of UV rays, which may help limit fading on furnishings exposed to sunlight.
Like the larger NSN70, this film uses a strong adhesive with a release liner. The listed installation approach calls for plenty of soap-and-water mixture on the window and adhesive side. The package details include tools and an installation guide, and the glass should be fully clean and free of blemishes before you begin.
The narrower, shorter roll may be easier to plan around than the 60-inch-by-25-foot NSN70 if your project is modest. Still, the supplied description warns that the film is sensitive and can wrinkle permanently if folded. The product details do not give a numerical heat-rejection percentage, so shoppers who want a stated figure should compare it with the 3M option.
Pros:
- Smaller roll for a limited installation
- Very light shade is designed to preserve natural light
- Blocks 99% of UV rays
- Includes tools and an installation guide
Cons:
- Less coverage than the larger BDF NSN70 roll
- No numerical heat-rejection percentage is listed in the supplied details
Verdict: Choose the NSH70 if its 36-inch width and 7-foot length fit your project and you want a light-shade film in a smaller roll.
How to Choose Clear Window Film for Heat Reduction
Check the Film’s Heat-Rejection Information
Look closely at how a product describes heat reduction. The 3M film lists up to 97% heat rejection for the 800–1000 nm range. That is a specific measurement range, not a claim that it rejects the same share of all solar heat. The supplied descriptions for the BDF films say they provide heat control but do not state a numerical heat-rejection percentage.
Measure Your Windows and Plan for Coverage
Measure the glass area you intend to cover before choosing a size. The 3M product is a 3-by-5-foot sheet, the NSH70 is a 36-inch-by-7-foot roll, and the NSN70 is a 60-inch-by-25-foot roll. Check both the width and length you need, and consider how you will make cuts while keeping enough material for each pane.
Consider How Much Light You Want to Keep
All three products are described as clear or very light, but the supplied details do not give a visible-light-transmission percentage. The 3M film is described as having low reflectivity and a clear appearance. The BDF films are described as very light shades that let lots of light through. If preserving a bright room is important, compare those descriptions and check the product listing for any additional specifications.
Compare UV Protection Separately From Heat Control
Heat reduction and UV blocking are different benefits, so check both. The 3M description says it blocks 99.9% of UV rays, while the BDF descriptions state 99%. UV protection can help reduce fading on furniture, carpets, fabrics, and artwork, but it does not mean the film prevents every cause of fading.
Be Realistic About Installation
These films need careful application to clean glass. The BDF instructions call for plenty of soap-and-water mixture on the window and adhesive side, and warn that folding the film may create a permanent wrinkle. The 3M product is intended for DIY application and recommends use with the 3M Sun Control Window Film Install Kit. Review the installation directions and make sure you have enough space to handle the sheet without creasing it.
Choose a Film That Fits Your Project and Tolerance for Risk
A small sheet may be easier to manage for a limited window project, while a long roll can provide better coverage for multiple or wider windows. Larger formats also mean more material to handle during application. If you are unsure about sizing or installation, start by confirming the window dimensions and reading the current product instructions before opening or cutting the film.
Frequently Asked Questions
Can clear window film reduce heat without making a room dark?
These products are described as clear or very light, and the BDF films are specifically described as letting plenty of light through. The supplied details do not include exact visible-light-transmission figures, so the amount of light in your room may vary by product and window.
Which option lists the highest UV protection?
The 3M Solar Clear description states that it blocks 99.9% of UV rays. The two BDF descriptions state that they block 99%.
Does the 3M film reject 97% of all solar heat?
No. The listing specifies up to 97% heat rejection measured from 800 to 1000 nm. Treat that as a result for the stated wavelength range, not a claim about all solar heat.
Which film covers the most area?
The BDF NSN70 is the largest listed option at 60 inches by 25 feet. The BDF NSH70 measures 36 inches by 7 feet, while the 3M film is a 3-by-5-foot sheet.
Do the BDF films come with installation tools?
The supplied descriptions say the BDF products include tools and an installation guide. They also recommend using plenty of soap-and-water mixture during application and taking care not to fold the film.
Can I remove the 3M film later?
The 3M description calls the film permanent yet removable as needed. Follow the product instructions for removal, and check that the film is suitable for your specific window before installing it.
Final Recommendation
For a small project where a clearly stated heat-rejection figure is useful, the 3M Solar Clear sheet is the most specification-focused choice. For broader coverage, the BDF NSN70 offers the largest roll, while the NSH70 is a shorter option for a more limited area. Measure first, compare the stated heat and UV details, and choose the format you can install carefully.