i'm sure you wont have any problems finding somebody to put themselves out by storing/watching yoru plasma for a short time, yeesh. I can send you my address if you get hard up. ;-)
anyway, i have a few of those that live in road cases non-stop, airtight and packed in foam, most of that time being slammed around on trucks and planes en route to and from shows. no temp controls at all, and no problems. the big thing is the ambient temps when its actually in operation, however i would still balk a bit at letting it sit and bake nonstop for for long periods of time with no relief.
shop around, there are tons of climate controlled storages to be found. it doesnt hafta be much, just enough to lower the temp and circulate the air a bit.