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The world is facing a rapid increase of air conditioning of buildings. This is being driven by multiple factors, such as urbanization and densification, climate change and elevated comfort expectations as well as economic growth in hot and densely populated regions of the world. The trend toward cooling seems inexorable. It is imperative to steer this development towards sustainable solutions. 

This IEA Annex 80 Subtask C report and the associated brochures provide examples of well-documented field studies. These field studies apply resilient cooling technologies to reduce energy demand and carbon emissions for cooling and reduce the overheating risk in different types of buildings, including newly constructed and existing buildings. Examples and details on building information, energy systems, resilient cooling technologies, key performance indicators (KPIs), and performance evaluation and lessons learned are included in the report and the brochures.

This report summarizes an assessment of current State-of-the Art resilient cooling strategies and technologies. It is a result of a collaborative work conducted by participants members of IEA EBC Annex 80. This report consists of four chapters.

The current trend in most Western countries regarding building ventilation is to follow the “build tight, ventilate right” strategy. New energy efficient buildings are indeed getting more and more airtight to avoid energy losses through uncontrolled air leakages. Instead of relying on natural infiltration, ventilation systems are installed to ensure a good indoor air quality (IAQ) with controlled ventilative air flowrates.

AIVC's Ventilation Information Paper #45.12 summarizes current knowledge on trends in building and ductwork airtightness in USA.

AIVC's Ventilation Information Paper #45.11 summarizes current knowledge on trends in building and ductwork airtightness in New Zealand.

AIVC's Ventilation Information Paper #45.10 summarizes current knowledge on trends in building and ductwork airtightness in the Republic of Korea.

The Book of Proceedings of the 43^rd AIVC - 11^th TightVent - 9^th venticool Conference: "Ventilation, IEQ and health in sustainable buildings" held in Copenhagen, Denmark on 4-5 October 2023.

The Presentations at the 43^rd AIVC - 11^th TightVent - 9^th venticool Conference: "Ventilation, IEQ and health in sustainable buildings" held in Copenhagen, Denmark on 4-5 October 2023.

To reduce the carbon footprint of the built environment, a significant overhaul of the existing housing stock is essential. This entails not only ensuring proper insulation and airtightness in residences but also optimizing their ventilation systems. To precisely gauge the impact of an advanced ventilation system, the use of a pressure node model, such as multizone ventilation models like COMIS or TNO's AirMAPs model, is indispensable. However, when dealing with existing dwellings, numerous unknown variables, including interior door usage, can introduce substantial variations in results.