Solar thermal works well even in northern latitudes, for example this municipal bath uses them extensively: https://maps.app.goo.gl/w571B7hTXCUBpN7Q6 https://ma

Solar thermal works well even in northern latitudes, for example this municipal bath uses them extensively: https://maps.app.goo.gl/w571B7hTXCUBpN7Q6 https://maps.app.goo.gl/w571B7hTXCUBpN7Q6 Edit: This building is of course a bit exceptional in that it is both well-aligned south-facing and has no trees or other things shading it. Another thing working in it's favour is that reflections from water, ice, and snow also provide a non-negligible boost in captured energy.