How about cool day, top down....and heater on full blast?
Several years ago when DH and I went to Florida for vacation, at the car rental they said we could upgrade to a convertible (bright red no less) for only $10 more per day, so we jumped at the chance to have a cool car for the week.
The sun was shining but it was cold for Florida, but we just HAD to put that top down and enjoy it so we turned the heater on.
We didn't have the windows up though.