In 1998 the Dutch ventilation industry launched a new generation of domestic ventilation systems on the market with high efficiency heat recovery applying counter flow heat exchangers and DC fans. It is expected that these ventilation systems will play an important role in realising the goals of the Dutch national energy policy for reducing energy use in the built environment. Another important aspect is the contribution to a healthy indoor environment in dwellings with an extreme high energy efficiency, especially in relation to increasing air tightness and thermal insulation. First measurement results in practice show that these systems provide a good indoor environment regarding indoor air quality, thermal comfort and noise. Energy losses for ventilation can be reduced by 8 to 10 GJ/year.