That little bit of tint most likely won’t do much to lower the cab temps. I have 20% all around and it still bakes.
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I haven't done any ambient temperature comparisons but it has reduced a lot of the heat and made the cab manageable. Had I only done the front windows I don't think it would have made any difference except when the sun was baking me through my window, which is why I did the whole cab (not just the untinted fronts and windshield).
It was not cheap to pay for "some" improvement but with the options I had available it was best one for me. The results were better than I expected so it was well worth it to me. YMMV.
Before Tint:
- Anything over 75F (sunny) or 80F (overcast) and the A/C was completely ineffective even on MAX A/C with max fan speed (#7).
- After the truck sat in the sun all day (e.g. I'm at work) the only way to cool the cab down in less than 20 minutes was to roll the windows down for the first few miles.
- I drive mostly north to get home from work so the afternoon sun is beating on me through my driver's window for most of the commute. I wear long pants, an undershirt, and a button-up/polo for work so every day this summer I would get home with back sweat.
After Tint:
- A/C maintains the cab comfortable on normal A/C with a fan speed of #5 with outside temps 95F and sunny (hottest I've been able to test so far).
- After sitting all day in the sun the cab cools down in about 5 minutes with the windows up and normal A/C on fan speed #7.
- I still feel the sun through my window on the afternoon commute but nowhere near as hot. Along with the comfortable cab I no longer have back sweat when I get home.
I could have gone darker for better results but I wanted to stay as close to OEM darkness as possible, minimize my vision loss at night (I drive a lot in the dark), and minimize my chance of getting pulled over for my tint being too dark. The only reason I initially went 50% on the front windows was so that the windshield didn't look like it was tinted.