Cold weather finds every gap a house has. Before the first freeze, check attic insulation depth and ventilation, confirm bathroom fans vent outside rather than into the attic, and look for staining that hints at past roof leaks.
In living spaces, test every window latch and run each faucet to watch drainage speed. Outside, extend downspouts away from the foundation and disconnect hoses so frost-free faucets can drain. Thirty minutes with this list prevents most winter emergency calls we see.