On Dec 15, 2:54*pm, termtests wrote:
Is turning the main off still a good idea? *Also, should the furnace
be set at a little higher temperature while we're away when taking the
outside temperature into account? *Thanks for your time and courtesy.

If your thermostat is functional and accurate, and your furnace is
properly sized and maintained, they will maintain an interior
temperature of 60F whether its -20F or +50F outside. They already take
the colder outside temperature into account by running more often.

Turning off your main water is probably a good idea. If the furnace
fails while it's that cold, the pipes will freeze and burst.