My guess is that AMONG SENSE USERS, more undetected total kw hours are expended on EV chargers than hair dryers (certainly, no contest), or stoves or ovens (probably). The Sense data people could tell us for sure. The popularity of this thread certainly indicates that EV’s are more popular among sense users than the general population.
A/C you are right, I’m sure, is a bigger consumer overall even among sense users, and therefore A/C would be my priority for first detection.
However, there is also an argument that EV chargers should be particularly easy to detect, because they have a dramatic and consistent signature, and there are fewer than 10 variants. I don’t know for sure whether it’s possible even in principle to reliably detect A/C units across the board. I am very confident it should be possible to reliably detect EV chargers.