Frequently Asked Questions

Which film blocks more UV rays: Coavas or Niviy?

The Coavas film wins this one clearly. It blocks 99% of UV rays, while the Niviy blocks 92%. If you have expensive furniture, hardwood floors, or artwork near a sunny window, that 7% difference can matter over time. I’d pick the Coavas for rooms where sun damage is a real concern.

Is the Coavas worth more than the Niviy for heat blocking?

Yes, if heat is your main enemy. The Coavas reflects up to 95% of infrared heat, which is noticeably better than the Niviy’s 85% infrared blocking. In my sunny bedroom, the Coavas kept things noticeably cooler during peak afternoon hours. That said, both will help — the Niviy is still decent, just not as aggressive.

Which film is easier to install: Coavas or Niviy?

I found the Niviy slightly more forgiving during installation because its adhesive seemed a bit more manageable. However, the Coavas includes a complete 3-tool kit (squeegee, cutter, sprayer) right in the box, so you don’t need to buy anything extra. The Niviy also includes tools — wipes, knives, and squeegees — but the wipes come in random colors, which is a bit odd. Both need a clean, smooth glass surface and lots of soapy water to avoid bubbles.

Do both films work for daytime privacy only?

Yes, both are strictly daytime privacy films. When the sun is out, you get that one-way mirror effect where outsiders can’t see in. But at night, when your indoor lights are brighter than outside, the mirror effect disappears completely. Both manufacturers are honest about this — you’ll need curtains or blinds for nighttime privacy regardless of which one you choose.

Which film has better customer reviews, Coavas or Niviy?

The Niviy edges out the Coavas on rating — it sits at 4.4 stars from 6,252 reviews, while the Coavas has 4.3 stars from a much larger 38,953 reviews. The Coavas has way more real-world feedback, which gives me more confidence in its long-term performance. The Niviy’s smaller sample size but slightly higher rating tells me it’s a solid product, just less proven.

Can I remove either film without damaging my windows?

Both films are peel-and-stick and can be removed, but the Coavas uses a stronger pressure-sensitive adhesive that might leave more residue if you decide to pull it off later. The Niviy claims to be easy to remove, and its 90-day no-questions-asked return policy suggests they’re confident in that. If you’re a renter worried about deposits, the Niviy is the safer bet for hassle-free removal.