With increasing levels of insulation and air-tightness, the
importance of air change rates also increases. In heated or cooled buildings,
fresh air available from opening windows is no longer a desirable option due to
energy lost in the escaping air and that required for conditioning the incoming
fresh air.
In July 2007 the Government's Building
A Greener Future: Policy Statement announced
that all new homes will be zero carbon from 2016. Fresh air, supplied at room temperature, with
no unnecessary energy use will play a vital role in helping to achieve the
Governments targets whilst maintaining a healthy environment.