dpete2q:
We have a heat pump in our house and I think it's perfect for this area. It works fine in the winter, but the real benefit is in the summer. It makes an extremely efficient air conditioner, and is a lot cheaper than trying to cool your house with electricity alone. Considering how hot it gets here in the summer (and how long the summers are), it's something to think about.
Another thing to consider is that the weather changes constantly. It's not uncommon to have days in January that are warm enough to need only a light coat. Then, two days later, it will be below freezing. Because the heat pump acts as both a heater and an air conditioner, it can very efficienty switch back and forth between the temperature ranges.
If you do go with a heat pump, some things to consider are:
(for a larger house)--Make sure you get either a very large heat pump or two heat pumps. Many people complain that heat pumps don't warm the place up enough, when the problem is that they simply bought too small a heat pump. In any case, winters here are pretty short--much shorter than Maine. We really only have a few weeks out of the year where it gets much below freezing.
It's good to have some sort of back-up system just in case the electricity does go out. Our house has a woodburning stove that's capable of heating the entire place in an emergency. Some of the newer homes have propane back-ups.
All in all, I'm totally sold on heat pumps. They work perfectly for this area, where the summers are hot and long, and the weather in the winter varies on a daily basis.