@ixu,
I was trying to do similar to you - tried to find hours of my downstairs AC unit power consumption where Sense missed detections. I don’t have my central AC on a smartplug like you do so it’s a bit harder. I do have my furnace blowers (actually the whole furnace) on smart plugs plus my Ecobee command data, so I do have a couple proxies to use.
For my solid AC3 detection of my downstairs AC compressor, Sense is spotting about 207 out of 238 on hours, missing 31 hours. It also looks like it could be incorrectly spotting compressor usage as on in about 7 hours. I say “could” because the compressor can extend and stop runs independently from the thermostat commands and furnace fan, under certain conditions.
Those 207 detection usage data points match up fairly well with the Ecobee runtimes and the furnace fan power consumption.
