I follow this "heat rejection recommendation" for all of my vehicles. All Rear Glass: Llumar AIR 80 and 3M Ceramic IR 70 - this brings the rear dyed glass VLT to around 20-21%, which is a very close match to 25%.Front Doors: Llumar IRX 25 or FormulaOne Pinnacle 25, 3M Ceramic IR 25.
Windshield: Llumar AIR 80 (to maintain visibility), Llumar IRX 50, FormulaOne Pinnacle 50, 3M Ceramic IR 70/50.
If you're focusing on heat rejection, here are my recommendations: If you're goal is for privacy and aesthetics, apply a 25% color-stable or lower-tier ceramic film to the front doors Model Y rear dyed glass (alike other models and manufacturers) rear glass measures around 23-27%.
Where maximum heat rejection is required, no matter the cost. Top Tier Ceramics: Spectra Photosync IRD, 3M Crystalline (70-90% ONLY). Where heat rejection is priority, while maintaining vision clarity. Mid-to-high Tier Ceramics: Llumar AIR, Llumar IRX, FormulaOne Pinnacle, 3M Ceramic IR. 
Lower-Tier Ceramics: Llumar CTX, FormulaOne Comfort, 3M FX-PM. Best for privacy, or to color-match front "clear" glass to factory rear dyed glass. Color-stables: Llumar ATC, FormulaOne Classic, 3M Color Stable. Some ceramic films absorb heat more than others, which leads to glass feeling hotter, due to the stored solar energy in the film Ceramic window film does two things: rejects AND absorbs UV and IR. If you’re applying tint for heat rejection, every piece of glass must be covered to justify the additional cost for ceramic film (all side and rear glass and windshield excludes roof glass). If you’re applying tint for privacy, save money choose a lower-tier ceramic or color-stable film. SunTek color stable films are great, however ceramics pull blue on most automotive glass. Geoshield has decent color, could be better, and is hard to find (at least to my locale). Crystalline CAN pull rather green or brown, depending on the vehicle glass in which is applied 3M - I like Ceramic IR, but not a fan of Crystalline. STEK films have great color, but lack the clarity I prefer in films. XPEL’s formula changes in 2019/2020 which changed the films durability. Llumar and FormulaOne are my preferred film brands Clarity and color are outstanding, application is among the easiest, and the films are very durable against scratching and chaffing. I’ve yet to use a Spectra film and welcome feedback from users. I’ve had firsthand experience with many big players in window film: XPEL, Eastman Chemical brands (Llumar, FormulaOne, SunTek), Geoshield, STEK and 3M. I welcome feedback from other self-educated and professionals to supplement the information in this post. My comments and feedback is purely based upon my experience over the past 15 years using window tint, with 7 of those years as an installer. Two recent road trips from JAX, FL West Palm Beach, FL & JAX, FL Asheville, NC in the hot summer months confirmed this.With the numerous recurring posts asking the same window tint questions, I wanted to create a central resource for owners on this subreddit. I find with the tint, ESPECIALLY the CR90 on the pano & windshield, in the summer months on road trips helps the A/C so it doesn't have to work nearly as hard and thus consuming more energy. As we know bumping the A/C up by 1F can have an impact on energy consumption. while I didn't think much of this since you can turn the car's A/C on remotely, what I didn't anticipate was the benefit to road trips. It has a huge impact on the heat in the car. FL law says no darker than 15% on front doors & 20% behind that. The 15% is technically illegal where I live (FL) but had no issue from cops (knocking on wood). couldn't do it the same day as the CR90 since it was still a bit wet). Video & pix below (the strip on the windshield isn't them as I had that added yesterday. this is 100% clear (you can't tell it's even been applied at all except in the area where the teflon strip & dots are along the edges) & blocks 99.97% UV. The pano sunroofs & windshield also have 3M Crystaline (CR-90) on them. WHAT: I've got 3M FX-HP 15 (15% light allowed thru) on all doors, the rear windshield & in a small strip across the top of the front windshield. Seen bunch of questions in different forums about tinting a Model S, & had a few questions when I mentioned deep in another post, so posting my experience here.
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