Yes they work

… is great for staying warm in freezing weather. And I’m fine with bringing my warm body to the provider’s place. At least we don’t have mountains of snow to deal with, like last winter.

There is an old survival question -- you are out in the middle of nowhere in an approaching blizzard and your car door lock (the old fashioned kind, with a key and not a remote) is frozen with you are locked outside.  What do you do?
.
You can piss on the lock.