Have you considered water-bottle heat transfer solar?
Place soda bottles painted dark in the sun during the day to collect solar warmth, move them to the chilly part of the house to radiate their heat.

I'm starting the research on going solar again. The new setups are a lot less hellish than the heat exchange solar I grew up with. That was truly unpleasant.

Rather than leaves, which my neighbors complain blow around, I use branches and trimmings from hedges and pruning. They are less likely to move.

We need the snow for more than just earth-blanket. It also works as a heat-deflector. The land is really taking a beating.

And Jason makes great products! I like their toothpaste.