I live in Arkansas. If google is correct, 10% is allowed on rear and back windows of SUVs, 25% for front windows.
The tinting place is a highly regarded company in the area. Maybe the person I talked to was mistaken about the factory tint UV and heat protection on the Explorer?
There is UV protection on the windows of the Ex, but no solar protection, the car will heat up like an oven no matter your tint, it just takes a bit longer with more tint.
Google 'solar tinting' and you will find plenty of info on that, and if you choose to do any solar tint, make sure you tint the sunroof.
Top half of cabin, headliner roof area, sunglass holder, too hot to touch, & the sunglasses too!
There are posts on here and online about solar tinting, including the windshield.
The shops that do this state up to 80% of the heat in the car during summer can be blocked by solar tinting.
The windshield is huge and I can feel the heat coming off the dash even with AC while driving - so I believe it. That and the sunroof could make a huge difference.
Its a clear layer thats applied and supposedly its 100% optically clear - no distortion, no bubbles, no weird reflections, no polarization effects, & undetectable.
Adding such a layer to the windshield is a big no-no but a shop will do it likely with a disclaimer you would sign. And possibly a shop isnt available in your state.
They use 3M films as well as other top quality brands, so the material is good, but the installation must be excellent.
Lets just remember one thing - the car sitting in the sun with a window shade and vented - its still going to be 125* in the cabin no matter what you do.
...and in winter, the car will stay cold longer...oh the irony...
...jeez never again black on black holy cow is it hot, even 2 or 3 hours later the seats are toasty warm.