For insulation I'm looking at a wealth of things I've learned from this site. For walls I plan on a rainscreen design, Siding, air gap, radiant barrier house wrap, taped rigid insulation, sheathing. Interior walls might be rigid sealed with spray foam stuffed wit/h batts if time permits. Roof will be Texas Cool Roof design.
Cool Roof Design for Hot Texas Climate | Houston Cool Metal Roofs
My hvac design will be 1-2 Gree 27 seer 9000btu minisplit heat pumps. Regardless of man j Hvac sizing will boil down to my wife's cooling requirements.