My first design for the Chicken Palace was an earth berm - based on root cellars which used to be common here.My house in Catalonia was earth bermed. My larder/pantry/store was a deep hole dug into one of the terraces.
My first earth beremed house design was a two teir. The top tier was a greenhouse/sunroom essentialy that sat on top of the rest of the house which was below ground.
But when it came down to it I wasn’t confident enough in designing it or in the help I could get to build it. So I went with a structure that is much more common here in agricultural buildings called a pole barn.
It works fine and I love it but in the very hot days I yearn for the kind of cool you can really only get underground.