Patti,
Most heat in parked vehicles is radiant - through the glass. Good chance insulating the top will retain more heat. Possibly?  

A friend recently told me he had found that the most effective way to keep the interior less hot was to crack the windows and open the sunroof (we call it a vent) to allow the heat to naturally rise. Seems to work, though it's still hot in Phoenix. 

Karl Wolz
Sent from my electronic umbilicus

> On Jun 11, 2015, at 4:55 PM, PB <pbrattan@GMAIL.COM> wrote:
> 
> I was just wondering if there was a way to *insulate the roof* of the pop
> top, either from the outside or the inside.