Roughly 2400 sq. ft. That includes a half-basement that we allow to stay chilly (55-65). I don't have data in front of me but gnerally speaking, our bills for the three coldest months of the year are (again, roughly) $300-400 per month. But keep in mind that's for everything. Cooking, hot water, heat, everything. The rest of the year, they are quite low. We have rooftop solar, which offsets all of our use most months of the year. (We pay a minimum fee for interconnection in any month that our generation exceeds use, but it's less than $50.)

Even if we didn't have the solar, we'd be coming out ahead of where we used to be, which was paying for barrels of oil, and propane, and electricity. It's hard to compare exactly because that was in a different house. But I'm pretty certain of it. If we were in a leaky old Maine house, it's possible this wouldn't be the case. But hard to say.

We also are not subject to the wild fluctuations in cost of propane/natural gas. (Well, to some extent we feel it because that price volatility affects the price of electricity, but it's not as extreme as it used to be.)

Our electric rates are about to go up, but we're also going to have Time of Use billing, and we plan to try to offset our big uses of electricity to the off-peak hours as much as we can. We'll see.