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You have reached and exceeded the balance point for your heat pump.
That is the available heat from the pump diminishes with a drop in outdoor ambient temperature until the heat required for keeping the house comfortable is no longer available. The unit will run continuously after the balance point.
There should be a second stage on the thermostat that will bring on your auxiliary heat be it electric strip/element or nat gas or propane.
There may be other ways of doing this too depending on the unit and its age.
__________________
Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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