That's my main beef with roll up or even overhead doors. It takes some effort to get an overhead door truly sealed and that's nearly impossible with a roll-up. A traditional door is clearly easier for those tasks. I do plan on working very hard to get my overhead door configured to minimize any air infiltration/exfiltration. It will be rarely opened, too. Honestly, if I actually had the time and space to do it, I'd build big, insulated carriage doors like Mike Farrington did for his shop. (YouTube) They are magnificent, but nearly equivalent of "swinging walls" when it comes to conditioned space.