I am often asked where to go to get more information on solar passive and sustainable designs. I always suggest this Australian government web site, Your Home. It has a technical guide to help the design, construction or renovation of homes to be comfortable, healthy and more environmentally sustainable. The passive design section gives a great explanation of an efficient house and has a great run down on thermal mass!
It also gives 25 case studies of new houses and renovations. It also provides a checklist which would be handy to take to meeting with architects, designers or display homes.
Earth Dwellings 
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