The latest Home Assistant version requires a clear unit definition for the power factor sensor. Please manually set the power factor unit as ‘%’ in your YAML configuration.
We’re committed to regularly updating our integration with new features. However, please be aware that the review process can be extensive, and sometimes our submissions are delayed or not approved due to various, often unclear, reasons. Here’s our latest PR for reference: Bump iammeter to 0.2.1 by yangbo1979 · Pull Request #95885 · home-assistant/core · GitHub.
Additionally, if you’re looking for other integration methods, this link might be useful: Four ways to integrate the Electricity Usage Monitor (IAMMETER) into the home assistant. It outlines four alternative ways to integrate IAMMETER with Home Assistant.