We like to see a balance. Screens which are left down continuously are in the way, and subject to the same dirt accululation as the paint on your walls. Screens left rolled up can get a memory for tab undulations, which may take additional time to flatten when the screen is deployed. Screens which are used rarely, seem to be a little bit more prone to wrinkling issues. I would recommend that you leave the unit down overnight, once or twice a week. And if you use the screen only occaisionally, try to deploy it at least a half an hour before showtime.
An often overlooked aspect of designing a theatre with an electric screen is keeping a reasonable temperature adjacent to the unit. When mounting a screen in an attic, some care should be taken to insulate the area, keeping the screen protected from high attic temps. Stewart screens can survive in hot attics, but useful life is definitely shortened. It's pretty easy to stuff a couple bats of R-19 above and around the case.
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