I am having that concern as well; it is a black rubber roof and retains a lot of heat. however, we are regularly quite breezy, if not right windy, here - I'm not all that far from both the harbor and the Mystic River- so I think some temp tests might be in order, that's a very good idea Louis. I'll be running them this weekend, it's supposed to be pretty hot again.

the difficulty is actually twofold. to build insulated enough for some fairly cold winters, that can also be cooled for hot summers.

I have been looking into a saltbox/solar slope design, that would have polycarb only on the long slope, short slope vented. Insulation works both ways, obviously, so if the temps aren't too high a swampcooler might be able to handle it. Utilities are not a problem, both water and electricity are close by, and use of the existing roof drains for runoff. I'm a long long way from commiting to the project, I have a lot of reading and research to do, but the possibilities are exciting.

thank you for your responses.
peteMc