How realistic is living aboard through winter in a colder climate?

[Crazy Talk]

Southeastern PA gets its share of cold. Snow amounts are usually manageable, especially around Philadelphia where the marinas are. The temps can hang around zero for a couple weeks and be sub freezing for a month long stretches. Not sometimes Canada decides we need some of their winter fun.

Ive seen diesel and other types of heaters available and I am willing to pay for some warmth. Can I keep a 30-35 foot boat reasonably warm (67 degrees F) consistently and without breaking the bank in conditions as I've described?

At this point I am just trying to determine if this is feasible or I need to rethink some things.