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That really does entirely depend on the size and style of the SFH, location on the land, lifestyle, etc.

Single family homes are often easier to power off-grid with solar if that's on the table, though again with regards to externalities the solar power equipment likely sends those costs to multiple countries on the other side of the planet.

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They would still use more energy in total, since flats insulate themselves to a certain extent due to having less outside walls & tend to be smaller requiring less energy to heat the space. You can also power flats with renewable energy. At this point less total energy is good regardless.

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