We have a tropical roof over the sleeping area....but for our awning we decided to make our own solar blanket...
bought some roofing insulation (its silver on one side, silvery orange on the other, and has a orange sponge material in between..a couple of mm thick).
We then put holes in it that lined up with our awning pole holes....Used some cloth tape to re-inforce around the holes...
Then bought some plastic clamps from BCF that allow you to clamp the insulation to the edge of the awning...if it looks like it will get windy, I just run a couple of ropes over the top of the awning from side to side to stop it form flapping. The clamps stop it from taking off.
It works a treat and cost very little.
MarkVS