Mini Splits are far more efficient that what's on the roof but they are still just heat pumps.
The best ones ($$$) will heat down close to 20 deg outside temp, below that they need an electric heater in them to produce heat, not very cost effective. There is a tone of information online on how they work and their limitations.
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I was once intelligent beyond my years. Now, I’m years beyond my intelligence.
2020 Montana 3561 Legacy, everything except paint.
2018 Silverado 3500 DRW, 50Gal Transfer Flow, Andersen hitch.
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