The document discusses various technologies for making buildings more sustainable and achieving zero-carbon living, including highly insulating materials, photovoltaic thermal solar collectors, geothermal heating and cooling, phase change material thermal stores, and voltage optimization systems. These technologies can provide passive house levels of insulation, increase electrical output from solar panels, store solar thermal energy for longer periods, and reduce energy usage from the electrical grid. The goal is to redefine renewable technology through appropriate technology selection and value engineering to create cost effective zero-carbon living solutions.