Louis Theroux tried to make a documentary about them. He’s done some really good work showing the worst groups in the world as, you know, actual human beings. Like the westboro baptist church.
The Scientologists refused to talk to him. Him talking to ex-members unleashed a stampede of harassment both against them and him.
The result is called “My Scientology movie”. It’s worth a watch if you’re interested in their techniques to keep people from leaving.
OP is asking about ambient temperatures below -15°C.
I recently bought a cheese freezer which had the exact same specification listed as a feature. I considered keeping mine in the garage that I keep around 7-10°C in the winter.