The lastest climate controls were displayed at Eurotier in 1996. The units are reliable, use less energy and have lower installation costs. Suppliers have heeded calls for ventilation equipment to be more cleanable and to have a system of emergency ventilation in each mechanically-ventilated house. Controls are by time, temperature or relative humidity, while the designers have aimed for limited water requirements and greater durability. In total 9 devices are summarized in the article.