Indoor air renewal can represent up to 50% of the dwelling’s energy consumption, and is therefore a key parameter in the buildings’ energy need reduction. As a consequence, ventilation is thus a trade-off between indoor air quality and energy efficiency. A variable air-flow adapted to the need is an ideal answer to those seemingly contradictory requirements and demand-controlled ventilation can be adapted to the various local (national) markets. In new buildings, the ever increasing thermal insulation reinforces the weight of ventilation on the energy consumption, thus making the control of airflows an absolute requirement. Renovation, on the other hand, requires easy to implement and easy to maintain solutions. Aereco proposes efficient demand controlled ventilation solutions to answer to these major issues.