I recall that video. I wonder how the math compares of their costs during the summer, vs the cost of transportation.

Sure, you need to avoid frost in the greenhouse; which there is an insulation factor from the walls and glass; and that's only 37 degree f; a lot less than human habitable spaces.

Does it scale? Profitably, no, because transportation of oranges from California and Florida to Nebraska is currently quick and cheap.

The issue of temperature control is covered extensively in the video as are some economic concerns (he sells oranges at NE farmer's markets!). What I wonder is if this could be a viable business. Land and possibly water could be cheap in that part of the country. Energy costs are negligible due to the design. Of course, there would have to be a big upfront capital expenditure and some time to get something like this going.

I think this has come up on HN before, but Low Tech Magazine has a great piece about citrus production in the Soviet Union: https://solar.lowtechmagazine.com/2020/04/fruit-trenches-cul...