Sorry to get defensive, there’s a lot of smart asses on Reddit (including this post). Damage to your house is caused by burst pipes with pressurized water in them. Pipes burst because the water inside expands when it freezes. If you leave the faucets open, the idea is if the ice expands it will push out water that’s still 32.1 degrees. The pipes don’t all freeze instantaneously, so it helps equalize any pressure that might build up. Doesn’t work 100% of the time (you have to winterize for that) but it’s another thing to help.