When shopping for window film in New Orleans, you will encounter dozens of specifications. VLT, TSER, UV rejection, shading coefficient, the list goes on. But if keeping your home cool through 8 months of cooling season is the goal, one spec matters more than the rest: infrared rejection (IR rejection).
At Big Easy Home Tint, we walk through this spec sheet conversation at almost every consultation across Orleans, Jefferson, and St. Tammany Parish. Most homeowners come in thinking “darker equals cooler.” It does not. The right number to focus on is invisible to the eye, and choosing film based on darkness alone is how people end up paying for performance they are not getting.
This guide explains what IR is, why it matters more than any other spec in our climate, and what numbers to look for when comparing quotes.
If you would rather have us walk through real film samples in your home, contact us for a free consultation.
What Is Infrared Light?
Sunlight contains three types of energy: visible light (what we see), ultraviolet light (what causes sunburn and fading), and infrared light (what we feel as heat). Infrared radiation makes up about 53 percent of the solar energy hitting your New Orleans windows, more than half of the total heat gain comes from this invisible part of the spectrum.
When you stand in a sunny window in your Metairie kitchen or Lakeview living room and feel warmth on your skin, that is primarily infrared energy. It penetrates glass easily and heats everything it touches: your hardwood floors, your sofa, the air itself.
IR Rejection vs. Total Solar Energy Rejection
You will often see two heat-related specs on window film spec sheets:
- Infrared Rejection (IR or IRR): The percentage of infrared energy specifically blocked
- Total Solar Energy Rejection (TSER): The combined rejection of all solar energy (UV plus visible plus infrared)
TSER is a broader measurement, but it can be misleading. A dark film might have high TSER simply because it blocks visible light, making your room darker without necessarily blocking more heat. IR rejection tells you specifically how much heat-causing energy the film stops, which is what you actually care about in our climate.
Why IR Rejection Matters More Than VLT
Visible Light Transmission (VLT) tells you how dark the film appears. A film with 70 percent VLT lets through 70 percent of visible light, which is fairly clear. A film with 15 percent VLT is quite dark.
Here is the key insight that catches most homeowners off guard: darkness does not equal heat rejection. A cheap dyed film might be very dark (low VLT) but reject minimal infrared. Meanwhile, a quality ceramic film can be nearly clear while rejecting the majority of heat-causing infrared energy.
This is exactly why people install dark dyed film, expect a dramatic comfort improvement, and end up disappointed two summers later when their west-facing rooms are still hot. The film looked the part. It did not perform the job.
IR Rejection Ranges by Film Type
Not all window films perform equally. Here is what to expect across the categories available in our market.
Dyed Films: 20 to 35 Percent IR Rejection
Basic dyed films rely on absorbing light rather than reflecting infrared energy. They darken windows but provide minimal heat rejection. The dye also degrades over time in our Gulf-coast humidity, turning purple and losing what little effectiveness it had. Not recommended for permanent New Orleans residences.
Metalized Films: 40 to 55 Percent IR Rejection
These films contain metal particles that reflect some infrared energy. Better heat performance than dyed, but they can interfere with cell signals, GPS, and Wi-Fi mesh systems, which matters more in modern New Orleans homes than it did 10 years ago.
Carbon Films: 50 to 65 Percent IR Rejection
Carbon-infused films offer improved IR rejection without signal interference. They maintain a matte appearance and do not fade like dyed films. Good middle ground when budget matters but you still want meaningful performance.
Nano-Ceramic Films: 70 to 82 Percent IR Rejection
The current technology leader and what we install most often across Metairie, Mandeville, Slidell, and across our service area. Ceramic particles are embedded at the nano level, blocking the majority of infrared energy while letting visible light through. No signal interference, no fading, the best heat rejection available in non-reflective films.
Reading the Spec Sheet Like a New Orleans Homeowner Should
When comparing window films, look for IR rejection tested at 900 to 1,000 nm wavelength. This is the peak infrared range and represents the most thermally significant part of the spectrum. Some manufacturers test at different wavelengths to inflate their numbers, so always confirm the test range.
A reputable installer in our market will provide spec sheets showing:
- IR rejection percentage (look for 70-plus percent for serious heat reduction)
- The wavelength range tested
- VLT so you know how the film will look
- UV rejection (should be 99 percent on any quality film)
- TSER for the full solar energy picture
The Bottom Line for New Orleans Homeowners
If heat reduction is your priority, and in our summers it usually is, focus on IR rejection above all other specs. A film with 80 percent IR rejection and 50 percent VLT will keep you cooler than a film with 30 percent IR rejection and 15 percent VLT, even though the second film is much darker.
The spec that actually matters in this climate is not how dark your windows look. It is how much invisible heat energy never makes it inside your home.
Get a Film Sample With Real IR Specs at Your Home
Here at Big Easy Home Tint, we bring physical film samples and spec sheets to every consultation. We hold them up against your actual windows, show you the IR rejection numbers in writing, and let you see exactly what each grade delivers before you commit to anything.
Call us today at 504-676-5121 for a free in-home film consultation anywhere in Orleans, Jefferson, or St. Tammany Parish.
Frequently Asked Questions
What IR rejection percentage should I look for in a New Orleans home?
For serious heat reduction in our climate, look for 70 percent or higher IR rejection. Premium ceramic films hit 80 to 82 percent. Anything under 50 percent is not really doing the heat-rejection job in a Gulf-coast market.
Can I trust IR rejection numbers on the spec sheet?
Mostly yes, with one caveat. Confirm the test wavelength is 900 to 1,000 nm (the peak infrared range). Some lower-quality films test at narrower or off-peak ranges to inflate the percentage. Ask the installer to point to the wavelength on the spec sheet.
Why is my old dyed window film not blocking heat anymore?
Because dyed film starts with low IR rejection (25 to 35 percent) and that performance degrades further as the dye breaks down under New Orleans sun. By year 3 or 4, the actual IR rejection is often half the original spec. The window looks tinted but the heat passes right through.
Will a darker film always reject more heat than a lighter film?
No, and this is the most common misconception we hear. A clear ceramic film at 70 percent VLT can outperform a very dark dyed film at 20 percent VLT for IR rejection. Darkness and heat rejection are separate spec lines, not the same thing.
Does my home in New Orleans need maximum IR rejection on every window?
For best results, yes on south and west-facing windows. North-facing and shaded windows can use lower-grade film without losing much real-world benefit. We tier the spec by exposure on most homes to optimize budget.
How does IR rejection translate to actual room temperature?
A film moving from 30 percent to 80 percent IR rejection typically drops interior room temperature 5 to 10 degrees during peak afternoon sun, plus reduces glass surface temperature by 15 to 20 degrees. That is the difference between a usable west-facing room and an unusable one.
Will my Wi-Fi work with high-IR ceramic film?
Yes. Ceramic film does not contain metals and does not interfere with cellular, Wi-Fi, GPS, or any other signal. The signal-interference issue is specific to metalized films, which we generally do not recommend for tech-heavy homes in our market.
Does IR rejection get worse over time on quality ceramic film?
Properly installed ceramic film maintains its IR rejection within a few percentage points of original spec for 15 to 25 years in our climate. Unlike dyed film, the performance does not degrade meaningfully. That stability is a big part of why ceramic is worth the upfront premium.