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by gulfie 2323 days ago
https://permies.com/w/better-world : this covers this exact topic... in several different ways.

Most of the electricity being used in the Wisconsin winter is going to be for heating. The best dollar ROI is typically weather stripping and insulating followed by using a heat pump ( preferably ground looped ), and of course the best choice might just be a rocket mass heater.

For passive solar options : https://www.builditsolar.com/