Mike Cantrell wrote:Depending on where in Colorado you are, I anticipate you're going to want some form of insulation.
The idea of thermal mass replacing insulation can work, but only when it's rather warm every day and rather cold every night.
For example, here in Michigan, fuggedabaddit. We often go weeks in the winter with no direct sun and daytime highs in the teens Fahrenheit. Uninsulated walls, even if massive, will just be COLD.
That's one reason why there's no tradition of adobe houses here like there is in the desert SW.