##Car shade
Car shade
##Rain guards
Rain guards
I've been combining these two techniques for years. The car shade stops your car from turning into a greenhouse and it keeps UV light from damaging your dashboard. I use it even in winter.
The rain guards mean you can habitually crack the windows without worrying about the forecast. They let any heat that does build up vent naturally and it makes the fact that your windows are cracked less visible. Makes me feel a little more secure.
Even on the hottest days I've never been uncomfortable getting in the car so long as I remembered to use these. They certainly beat my old hack of rolling down the windows and driving like a maniac until the AC kicked in.