Am I correct with this observation? My delta resist is at -0.2 and my delta Heat (heatpump) is at +0.1 at 0C. Am I in a situation where my net heat loss is -0.1 degree per hour?
The profile values are absolute; you don’t need to do any mental math to read them. If the delta heat says +0.1°C, then that already accounts for normal heat loss.