This book supports HVAC planners in reducing cooling energy demand, improving the indoor environment, and designing more cost-effective building concepts. High-performance buildings have demonstrated that it is possible to exceed the energy requirements of existing legislation while achieving good thermal comfort. However, there remains significant uncertainty in day-to-day practice due to the lack of legislative regulations for mixed-mode buildings, which are neither solely naturally ventilated nor fully air-conditioned, but utilize a combination of different low-energy cooling techniques. Based on findings from monitoring campaigns (long-term measurements combined with field studies on thermal comfort), simulation studies, and a comprehensive review of existing standards and guidelines, this book serves as a commonly accessible knowledge pool for passive and low-energy cooling techniques.