Contact me for ideas from my experiences with earthquake resistant housing construction and working in seven countries as Habitat for Humanity's Director for Latin America and the Caribbean.
Here are some other areas I can help you explore:
Using your metal roof for cooling or heating. Building your home with wire fencing. Cheap. Secure. Earthquake proof. Turning your floor into a radiant heating system using solar heated air. Do-it-yourself solar air heating systems with low cost radiant heat wall Crawlspace solar air heating sytem Radiant wall solar-reliant greenhouse for $200