This means that sunlight can provide most of the energy for space heating needs. Trees and ivy trellises provide shade in summer and do not block sunlight during winter. The triple-glazed, thermally efficient windows are strategically located to make maximum use of solar gain and minimize heat loss in winter. Solar radiant floors have been specifically designed to retain solar heat during the day and radiate it to the interior at night. Heat radiates not only from floors, but from ceilings.
Sunlight is collected through solar panels and heat is retained.
If required, water warmed by the sun is circulated through pipes in the floors to supplement direct solar heat. In summer, heat gain is controlled by window shading and moderated air flow. Efficient electrical appliances and grey water heat exchangers provide less internal heat gain and less need for air conditioning. Excess heat is radiated to the ground surrounding the house. In addition, the waste water system provides evaporative cooling through a heat exchanger.