Building Leak Detection and Measurement: Zone Pressure Diagnostics (ZPD) Want complete building leak detection and measurement? Zone Pressure Diagnostics (ZPD) is one of the most powerful analysis tools available…. …and the calculation aid from Residential Energy Dynamics (RED) is the most accurate and easy to use ZPD tool available. This… Continue reading “Building Leak Detection and Measurement: Zone Pressure Diagnostics (ZPD)”