I have a larger house, about 2800 sq ft, so my heating costs reflect that of course. Your experience could be different. Some folks get by burning wood or pellets and supplementing with LP stoves when needed. Just be aware there is limited natural gas infrastructure so chances are high you'll burn oil or wood.

The semi rural environment can be a shock too, be prepared to drive to big box stores or fast food (or get out of the habit all together and support small local businesses). Generally things close up earlier too, not much night life.

If you guys are looking for slower, quieter lifestyles then I can't recommend VT enough.

Best wishes in whatever you choose to do!