[Winegrower]

Even in temperate weather it gets hot driving our coach and that's more a concern than when we're parked.  I'm rarely without the driver AC on.  I'm just about ready to spring for a 70% transmission (legal for windshield) ceramic tint to block primarily the infrared  although it does block UVA and UVB as well.  I've had all our cars here in Tucson done with it and it makes a HUGH difference, most noticeable in the summer but also even in winter here in the sunny desert.  3M is the most recognized brand but other brands are available and can be had with nationwide guarantees.