Viking House Shows Passive and Active Solar Technology

This Viking House is a good illustration of passive and active solar tech.  They also offer a consulting service  for owners of older homes.   Too bad they're in Ireland.  Still, their website has great information on several key energy-efficient technologies, such as heat recovery ventilation.

"Between a third and half of an Irish building's heat loss typically occurs through cold air exchange. Heat Recovery Ventilation is a technology that, whilst having been in existence for some time, is now rapidly gaining recognition in Ireland as an extremely efficient, health-beneficial, cost effective solution to saving energy. Scandinavian in origin, the Heat Recovery Ventilation System (HRV), follows the unique approach to environmentally harmonised living the Scandinavians are renowned for."