The detached two-storey Barna House was in need of a revamp, and the owner decided to take this as an opportunity to retrofit their house to passive house standards. The owner’s goal was to build a home offering a super-efficient energy performance and superior thermal comfort while preserving the structure’s historic character. Super-insulation, thermal-bridge-free construction, an airtight building envelope, and mechanical ventilation with energy recovery, were central to the project’s...