CoolerControl 3.0 update enhances Linux cooling controls
The CoolerControl utility has released version 3.0.0, introducing major architectural improvements and new features for Linux users. This update adds an API for third-party integrations and prepares the software for future hardware support. A follow-up v3.0.1 patch fixes minor issues and boosts UI stability.
On October 7, 2025, the development team behind CoolerControl announced the release of version 3.0.0, a significant upgrade aimed at Linux power users seeking better system cooling management. This version delivers architectural changes that enable more granular control over cooling profiles, including advanced sensor and profile functions such as custom sensor offsets with parent-child chaining and a difference mix function.
Key enhancements include the introduction of an API designed for third-party integrations, allowing scripts and other applications to interface directly with CoolerControl. Developers and system integrators benefit from these API changes, which facilitate easier customization within the Linux ecosystem. Troubleshooting has also improved: users can now adjust the liquidctl log level using an environment variable, and the previously separate liqctld service logs are unified with the main daemon's output for simpler analysis.
The update refactors the core architecture to lay the groundwork for future enhancements, such as device-specific and channel-specific controls. The release notes highlight that support for hwmon devices is coming soon, signaling expanded hardware compatibility ahead.
User interface refinements accompany the functional upgrades. The main menu now displays the host name, and on-screen metrics have been standardized for greater clarity. The v3.0.1 patch specifically addresses minor issues, including better handling of multiple-UI reconnections, and improves overall UI stability. Additional improvements extend to the project's website and documentation.
This release positions CoolerControl as a more robust tool for managing cooling in Linux environments, with a clear path toward broader device support.