Super hot or super cold presumably means too hot/cold for sheltering vegetation. In other words; Siberian tundra vs. Sahara desert.
I'd choose super hot. You always have the earth under foot, and the earth is always cool.
wiki:
Depending on latitude, the temperature beneath the upper 6 metres (20 ft) of Earth's surface maintains a nearly constant temperature between 10 and 16 °C (50 and 60 °F)
An underground or "earth tempered" home would always be as warm or cool as you wanted it to be, at no cost and no tech. Too warm? Close the windows. Too cool? Open a window.
Super hot or super cold presumably means too hot/cold for sheltering vegetation. In other words; Siberian tundra vs. Sahara desert.
I'd choose super hot. You always have the earth under foot, and the earth is always cool.
wiki:
An underground or "earth tempered" home would always be as warm or cool as you wanted it to be, at no cost and no tech. Too warm? Close the windows. Too cool? Open a window.