They do not die at room temperature, but they do not breed, either (so there is no need to fear a pest if some manage to get loose).
If set free in the house, they will eventually die because of dehydration if there is not enough humidity.
I keep mine in a small plastic container in a styropor-box (the things you use to transport temperature-critical things). Inside this box I have a heating - cable attached to the walls to keep the temperature high. A heating mat might work, too, but some of them can get quite hot.
A fast turnover might indeed be better but if you have the space for several cultures, they are almost self-sustaining after some time.
I personally prefer tropical white woodlice, they have a nearly similar size and a faster turnover.
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