Snitty, you gotta love lake effect snow, we get it too here on boston (perhaps not as bad as you) Usually after the first real snow storm, when the sun peaks through, I will take the doors and hard top off my jeep and cruise around, always wearing a huge smile. Damn I am a dork!!
Honestly, it won't be that bad, it might stink for short trips to the store, (heater won't be able to fill the entire cabin) but if you are driving for over ten minutes, crank it up and it will be at a comfy temp.
If my friends 75 super beetle with a stupid 30 year old electric heater can survive a New England winter, you'll be all set!
Johnny