Demand-controlled ventilation - an alternative to unnecessary air conditioning. Tarpeettoman ilmastoinnin vaihtoehto - tarpeenmukainen ilmanvaihto.

Good indoor air quality and thermal comfort and good energy-efficiency can be achieved simultaneously only if the amount of ventilation can be demand-controlled. Two approaches are discussed in the article: CO2- control and use of so-called air quality sensors. The first experiments have been promising but further development of equipment is still needed, in order to improve the reliability and economy of demand-controlled ventilation.