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I have Llumar ceramic film on my car, and it is fantastic at rejecting heat and UV. I can literally feel the difference on my skin between window up and window down in direct sunlight. I can drive all day with my arm on the door in direct sunlight and not get a sunburn through it.
It's not inexpensive, but if you apply it yourself you would at least save on the labor cost. You'll be able to work all the bubbles out of it with the right tools. Where a pro installation will make a difference is making it invisible around the edges.
If it's set up properly as a legitimate non-profit, you might want to see if any local installers would be willing to donate the labor. It would be a tax break for them, and they really wouldn't have any cash out of pocket if they can come during a slow time when it's not taking them away from paying customers. You might have had better luck with that during the winter months, but it's still worth a shot. They may even be willing to donate the materials if they have some spare rolls from a large job laying around that are essentially already paid for.
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