Carbon dioxide included in exhaled breath is often used as a tracer gas when estimation of ventilation aspect in buildings with occupants is performed.

For the coming energy-efficient buildings, the guarantee of energy performance becomes a major challenge.

Airtightness becomes a more and more important parameter in the rationalization of the energy consumption.  The quality of the works during the construction process is essential.

The term of “Active House” recently developed, addressing houses that target a balanced optimization of indoor environmental quality, energy performance and environmental performance.

Demand controlled heat recovery ventilation systems, which combines heat recovery (HRV) and demand controlled (DCV) is growing fast among ventilation manufacturers.

To realize the concept of low-energy buildings, an increase in the thermal insulation performance of building parts, especially the openings that show poor insulation performance, is necessary.

Numerous tests are being performed throughout Europe.

The Kindergarten Solhuset is built according to the Active House vision with an emphasize of good daylight conditions and fresh air.