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So I guess the thing is what is your monthly bill with oil and electric now and is your furnace in good shape or will it need to be replaced soon? There is a good rebate for heat pumps now from Efficiency Maine, but they are not cheap and neither are solar panels. And you would still have a sizable electricity bill in the winter to run the heat pumps. Maybe do a cost analysis?

(We are using heat pumps in the winter and have solar panels which generate our summer/early fall electricity. Wood burning insert for back up. Older farmhouse near Wiscasset with some insulation. )