I have probably a notoriously difficult mini-split scenario (Mitsubishi NAXMMX42A152AA outdoor unit and five indoor units (two different capacities1x24 and 4x6) connected to it. Still, Sense detected a “heat pump” and it shows in the timeline from the first day after install. However, I am still not sure if it really detects the entire system. All six parts are variable speed, of course and all indoor units go on at different times and some are mostly off (e.g. unused guest rooms). What should ease the detection is the fact that this is the only 240V system in my house (except the solar system and the sense unit), so one would think that a 100% correlation between the two phases should aid in detection. I’ll keep a watch on it.