The Remote Sensor app is a companion for @interrobang's Mitsubishi Heat Pump + MQTT Driver that lets you pair a temperature sensor with a heat pump (which can have very inaccurate internal sensors).
This is an alpha release, so I'm hoping to recruit some testers, especially those with hubs set to Celsius and/or cooling, before putting the app into HPM proper. Currently, you can install it via custom HPM repository or manually, as detailed in the GitHub repo.