When my family first moved to south Texas in 1951, we lived in a small adobe house.
Looked a little like this..
http://leclownlyrique.files.wordpres...-ward-1972.jpg
I think it must have been built in the early 1900s (or before),
The walls were really thick, and I remember it was it was pretty warm in the winter.
The adobe turned out to be too small and we soon moved into a large wooden house that really drafty..
But, back in those days, it cost peanuts to heat a leaky home.