When you park your car outside in the sun, it is going to get hot. It will get hotter than the the ambient temperature in fact. You can reduce this by putting one of those ugly reflectors in your window but most people are too lazy for that. Ultimately the only good way to fight this is by leaving your window open and having your car stolen.
But imagine if your car had a metal grating in the ceiling that could be closed up. While it is closed its like it is not even there. While open, the grating acts like a 'screen' and prevents would be thieves from gaining access to your car. However while criminals and other unwanted things could not pass through, the warm air would be able to rise right out of your car being replaced with 'cool' air from outside.
The system could be designed to automatically operate while your car is off. If the interior temperature is rising and it is cooler outside (and not raining) go ahead and open the grate cover. Determining if rain is coming down could be accomplished through a variety of relatively easy methods.
The entire system could run off, or at least partially run off, some small solar panels installed on the grate cover. The days on which it will be needing to operate will be the particularly sunny days when you are parked in the sun. It could even use the power output of these solar cells to determine if it should be opening or not.
While it will not keep your car cool in the same way an AC would, it would be a cheap, green, way to ensure your car does not feel like a pressure cooker when you get in.
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Have comments about my ideas? If you see something wrong with them, leave a comment. I'll try to comment back. If you have seen these ideas implemented/mentioned somewhere before, leave a comment. I like to think I am 'original' but that doesn't mean somebody has not beaten me to the punch. Finally, if you just have something to say, well comment that as well.