I mean sure but like in the worst case, window shades are a thing.
Edit: Or maybe this isn't about passive heating and you're saying long term storage might not be necessary in winter?
Some of the features of RMI's Carbondale office would probably be worth considering as part of a more thoughtful design.
Also, you're correct that there was never a need to store energy for months on end, at least at our latitude.
I mean sure but like in the worst case, window shades are a thing.
Edit: Or maybe this isn't about passive heating and you're saying long term storage might not be necessary in winter?