The Mazda sits parked with the windshield facing south.
It gets hot inside. I measured it at 140 degrees. We decided to get one of those silver windshield covers that pops open to block the sun.
It worked. In the heat of the day, it knocked the temperature right down to 130 degrees. A little later, as the sun moved across the sky, it was now coming in the passenger side, and the temperature went back up to 140 degrees.
Oh well.