Passive houses or “Nearly Zero Energy Buildings” (NeZEB) are these houses which demonstrate excellent thermal comfort all the year, maintain stable inside temperature throughout the whole building, without humidity fluctuations. They are equipped with special ventilation systems ensuring very low or nearly zero energy waste.
The above properties in NeZEB houses are secured by the substantial insulation of the building shell, the absence of thermal bridges, and by a automatic ventilation system that pre-heats or pre-cools, depending on weather environment, the fresh air it imports into the house. This is achieved without significant cost, taking advantage of the outbound air to heat or cool the inbound air within a heat exchanger. Yet more, these innovations regulate indoor humidity and filter the imported air, in order to provide the house with hygiene air content, cleaned out of outdoor pollution, pollen, dust and moisture.
In NeZEB houses, usual costly heating and cooling systems will under-operate due to high energy efficiency, and therefore can be replaced by such systems of low capacity, and thus money are saved from both the cost of the initial installation and their operation.
EasyGreen has embedded the knowledge and experience of its personnel upon energy-saving technologies into the first certified prefab passive house in Greece, built in December 2014. EasyGreen is a member of the iPHA (International Passive House Association) and of EIPAK (Greek Institute on Passive Buildings).
The certified residence is included at the international database of passive houses.
EasyGreen PASSIVE houses can be delivered with the following equipment*:
*The selected sections of structural-insulating shell elements and the equipment is indicatory for a house located in climate conditions similar to these of Attica region. The final arrangement for the proper sections and equipment can chance depending on the location of the house and accordingly to the results of the Passive House Planning Package (PHPP).
Synthetic window frames with double glazing, low emissivity film (Low-e), argon gas between panes and heat transfer coefficient Ug 0,7 W / m2k.
The costing for passive houses is deduced after their construction plan has been finalized and accordingly to the results of the thermal study in the PHPP. Indicative cost for EasyGreen PASSIVE housing over 100m2 is about 20% less than the overall cost of concrete energy-inefficient residences, and, depending on design and equipment, stands at around 1000 € / m2.
*The above cost is valid on building the house from the foundation plate and up, with materials according to the specifications’ guide for PASSIVE series, does not include VAT and is clear of long distance extra cost only for the regions of Attica, Viotia and Evia.