My system is "Hyper heat", it will throw heat down to -13. I had installed a year ago in October. I used it through December, but the electric bills got pretty high, so I switched back to my oil boiler for the rest of last winter.
As of right now I am still using the heat pump but I'm going to switch to my oil heat on Wed or Thurs, when temps are supposed to drop.
The lower the temp goes outside, the heat coming from the unit goes from hot air to just warm air. It just felt more comfortable with my regular heating system at that point.
I mainly installed them for AC so they worked flawlessly this past summer!
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