Okay, architect: I've used ICF's and SIP's, and I'm not sold on either. Fiberglas absolutely sucks, polystyrene is acceptable but not ideal, polyurethane is more effective but also more expensive. Both out-gas.

Hot air cools quickly. I'm inclined toward thermal mass and radiant floors for heat conservation, but there's no good solution for cooling in hot climates. We need to eliminate attic heat sinks, by design. HVAC "efficiency" is based on the unit, not the system. LEED is largely based on operating expenses, not total carbon footprint of materials. Where are the solutions?