Albuquerque isn't as high or as dry as say, Taos or Flagstaff, where I'd hazard (a WAG) something on the order of 10% savings with a mass-wall could be had at equivalent-whole-wall-R.

But truly high performance wall assemblies require more R than found in typical ICFs, and mass (even lesser mass) in something other than the wall in conjunction with a well considered passive solar design can far exceed ICF or other mass-wall approaches for energy use reduction in a desert SW climate, using far less baked limestone/concrete.

Bottom line, no wall assembly stackup or construction type gets an automatic "Green Pass"- the building as a whole (including the mechanical systems) really have to be optimized to work together as a system.

The best way to utilize concrete for thermal storage is to build a water tank with it :-).

:-) :-) :-)

Ah-yup!