Developed and integrated support for the inH₂O (water column) pressure unit within the home-assistant/core repository, focusing on backend development and data conversion using Python. The work involved extending core constants and conversion logic to accurately process water-column pressure measurements, ensuring consistent unit handling throughout dashboards and automations. By implementing comprehensive unit testing, the changes improved the reliability of pressure readings and enhanced automation accuracy. This update not only addressed immediate measurement needs but also established a scalable framework for future pressure unit integrations, reducing the complexity of subsequent enhancements and supporting ongoing improvements to Home Assistant’s core pressure unit system.