a standard for houses that are very environmentally friendly (= not harmful to the environment) because they can be kept at a comfortable temperature using no or almost no energy, or a house that meets this standard

The 50 unit residential development is to be built to the standards of PassivHaus.

An important feature of a Passivhaus is extreme air-tightness, which is necessary to minimize heat loss. 被动式节能屋的一个重要特征是极高的气密性，这对最大限度地减少热耗而言是必需的。

Passive House buildings use energy sources such as the body heat from the residents or solar heat entering the building.