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When it comes to improving your home’s energy efficiency, privacy, and comfort, window film is a smart, cost-effective DIY solution. At Concord Window Film, two of our top choices—ComforTech 25 and ComforTech 35—are favorites among homeowners for good reason. But which one is right for your space?
In this guide, we’ll look at ComforTech 25 vs ComforTech 35 and break down the key similarities and differences to help you choose the best fit for your windows—and your lifestyle.
Both films belong to our ComforTech™ Ceramic Series, designed for homeowners who want premium solar control with a more neutral charcoal look. Here’s what they both bring to the table:
Whether you’re installing in a sunny living room, a street-facing home office, or even a garage workshop, both films offer top-notch performance.
Here’s where it gets interesting. While the core technology is the same, the differences between the two films come down to visible light transmission (VLT), solar control, and privacy level.
| Feature | ComforTech 25 | ComforTech 35 |
| Visible Light Transmission | 25% (darker look) | 35% (lighter appearance) |
| Privacy Level | Higher privacy during the day | Not considered a privacy film |
| Glare Reduction | Excellent | Very good |
| Heat Rejection | Total Solar Energy Rejected: 69% | Total Solar Energy Rejected: 58% |
| Best For | Sunny rooms, day time privacy, energy efficiency | Balanced light and heat control, subtle tint look |
| Buy Now | Shop ComforTech 25 | Shop ComforTech 35 |
Still unsure? Here’s a quick breakdown of which option might be better depending on your needs.
Both films install exactly the same. Check out our How to Install page for all the details.
Our installation videos are a great way to get comfortable with the installation process and the film also comes with written instructions. In addition, we have a PDF guide you can also reference. Finally, our US-based customer service staff is (almost) always available to answer any questions you might have.
Our films are made for confident DIYers. You don’t need to hire a professional—just take your time, follow the guide, and you’ll get great results.
Real homeowner reviews are one of the best ways to make a decision about ComforTech 25 vs ComforTech 35 before you purchase. All of the reviews can be found on the product pages for each film and only authenticated purchasers of our film can be posted on the site through our review application. Here’s a sampling of what other DIYers are saying about each film:
“Great customer service. Easy to work with the film. I’m 73 and this was simple for me to do… I am hoping this will help the heat transfer in my west facing windows.”
“I questioned whether installation would be effortless, and I am delighted with the outcome. … The Florida sun is unyielding. Very pleased with the results.”
“We were originally unsure how we would like the tint but now that it’s installed we love it. … It has really reduced glare and heating in the room. Highly recommend.”
“High quality film really helped with glare and heat on my west‑facing storm door. … I would recommend Concord to anyone looking for DIY window film.
Both ComforTech 25 and ComforTech 35 offer powerful solar control, energy savings, and a polished look. The difference comes down to how much light and privacy you want.
Shop now and get started on your next DIY project with confidence:
👉 ComforTech 25 – Max Privacy & Heat Rejection
👉 ComforTech 35 – Balanced Light & Comfort**
Want to see our professional-grade window film before you buy?
Get our window film sample kit which includes 5″ x 7″ samples of all five ComforTech™ performance shades, Matte White and Silver 15 Reflective.
Plus you’ll receive a coupon for $5 off your first purchase in the kit!
