We have something similar in the southwest called Earth Ships. These homes are made of soil compacted used tires and a stone/mortar mix or sometimes aluminum cans and mortar. In the summer a large south facing angled window runs the length of the house doesn’t see the sun all summer and in the winter, the sun’s angle changes to allow all the light/heat in. We got way more than an 8° difference, 100% passive, at 130F° outside… and if you know anything about the Sonoran Desert, you know the nights can be deadly cold. You can actually go hyperthermic when the temps drop to 100F° immediately as the sun sets. Earth Ships stay stable all year long.