I don't :/ I do have a smart home setup but it is local-only. I think I am capturing most of the data I need.

I know when my HVAC is running. I know how much power it is using. I know the temperature of every room, I have a stat outside so I have realtime temp/humidity of my location...I just don't have a way to capture and record how much heat is being generated. I'm wondering if putting a temperature sensor directly on an air vent would let me capture it over time