The people who build earth ships certainly think so

Have you watched garbage warrior?

Yup. Plenty of greenhouses in cold climates growing tropicals year-round with no power input at all. (Some work needs to be done with some designs to prevent them from getting too hot in the summer, though.)

https://www.youtube.com/playlist?list=PLGOJQruZ_XalVwbbQrhCk0BzZmcsYdhOY Ignore the Mormonism, the build series is legit.

Elliot Coleman spent much of his life designing low cost modular greenhouses for vegetable production in Maine. He would use double layering techniques such as frost cloth over hoops inside a poly tunnel with a bubble wrap like covering. The goal was to stay above freezing passively and proved it out. Other greenhouse attempts use long piping or hoses that extend either down deep or out horizontal. The idea is to intake air that is brought to the average temperature rather than either extreme. I have been inside sunken greenhouses, that use the hill behind as a giant wall that is lined with 50 gallon drums of water to create a thermal mass. The drums are heated by the sun and over time it requires a lot of energy to shift the temperatures. I know that Permies Paul has done years of attempts at building natural even temperature dwellings. The utility of a rocket stove designed to pull the heat though large masses of concrete in homes is nice for northern climates. This is also why fireplaces have big river rock chimneys and stone hearths. To hold the heat.

Keep an eye on the Mormonism, just so it doesn’t sneak up on you

Well, sure. But Mormons are VERY good peppers. (They are required to be.)

@Wild Burro can advise

The thermal mass of the Superadobe walls was working well in late summer with highs in the low 90s - cool in the day and warm at night. It’s very cold now in the winter. Will be installing a heating system eventually and documenting the process

Do yall design for a wood stove?

@Wild Burro what wall thickness do yall use? Any air gap in there, or is it massive build?

yes. many earthship builds have done this. including at least one that i know of in mid eastern Canada.

Leaning toward radiant floor heat at this point

It’s 15-18 inches of solid earth

Yuge. I’m guessing the environment there is dry. Any seismic loads out there?

I don’t think so but the domes should be earthquake resistant