I have the SENA-12HF-Z in our 550 sq-ft upstairs master bedroom (west and south wall sun exposure). Here in Houston we have to push its turbo mode quite a bit if we forget to leave it running while we are out.
Documentation is pretty sparse and tech support is rather uninformed (are they really guessing?). That said, with a 24k you may find "auto" mode becoming your default setting. It is the quietest of all the modes and if you run the unit 24/7 it seems to do fairly well at holding temperature. My electric bill runs about $100 most months in my 2500 sq ft house running 5 mini splits totaling 7 ton max capacity. I never have seen max capacity with the inverters......
