For the last two weeks temperatures in Wisconsin have been mostly sunny and between 90 and 104 degrees. VERY unusual for this area.
During this time I started using my CA Pop Top sun shades every day. Having 3 cars and a single garage means two cars are out in the sun all day. The difference in interior temperature when using the CA Pop Top versus having all four windows cracked was HUGE. The advantage of this type of sun shade is that it covers all
window glass and the entire top of the car. The interior (including seats, dash, steering wheel, etc) stays significantly cooler making it easier for the A/C to cool the car.
I highly recommend these sun shades no matter what type of car or truck you own. The web address is http://www.capoptop.com
, the phone #is 661-257-7830 (ask for John) and they are located in Valencia, CA.