@johncantor who we have been working with on heat pump monitoring for quite a few years now has posted a nice introductory video on monitoring heat pumps with an emonTx or emonPi.
He gives a good example of what you can do with simple electricity and system temperature monitoring in a way that’s relatively easy to retrofit onto an existing heat pump system (compared to installing heat meters etc)
John has also been doing a range of other video’s on other interesting heat pump related topics such this one on a simple heating simulator tool that he has put together:
Heating Simulator John Cantor - YouTube
another on pressure drops and flow rates:
Flow-rate and pressure-drop simulator - YouTube
heating old buildings with heat pumps:
heating old buildings with heat pumps - YouTube
heat pumps and the potential harm due to refrigerants
Heat pumps and the potential harm due to refrigerants - YouTube
If you find any of these useful, Im sure John would appreciate a comment or other sign of appreciation on his youtube pages. I know he has put a lot of work into these and has a wealth of knowledge on the subject that he’s always been very happy to share.