Ventilation is a crucial aspect in super-insulated and airtight buildings. Façade-integrated ventilation systems are a state-of-the-art technology which is considered an energy efficient option. Results of the conducted evaluation in Nordic context show that some aspects need adaption to local requirements. However, good performance can be expected in fields like indoor comfort and user satisfaction. The technology has enormous potential and might be an alternative if there are high expectations on indoor environment but conventional ventilation systems are not applicable. The used tools in this work include ESP-r and Simien for dynamic simulation of building performance.