I agree with @Twitcher about contacting the owners, @Twogreys 
the THS code of conduct means owners agree to provide a clean, comfortable, and secure environment. I think making sure you’re warm enough should come under “comfortable”.
I thought you might find some inspo from a topic from last year - Heated blankets? Ways to stay warm in winter. - as a result of that discussion I bought a heated blanket which I’m very thankful for especially as it’s currently -4 here in Scotland 