pH,
If the neighbor can't keep a close eye on the house as it warms, I'd leave it alone.
If a line has frozen in the house and he turns the heat up to say 23c or so, it may thaw the line and then...................
Not a very cheerfull thought I know, but would hate to have you get home to worse than a frozen pipe.
Was -16c here this morning in Michigan.
Enjoy the warmth while ya can man!
