Remember to dig out any exterior vents when the snow starts to pile up.
Here we dug out our dryer vent - which is vented very low (eek... not to code) out of a basement window.
But more important than this - be VERY sure your furnace vents are free and clear. And always make sure your CO detector is working.
Oh... and also remember cars buried in the snow will have their mufflers blocked. Do not sit in a running car with the muffler blocked.