yea but many places in winter heat pumps efficiency goes to basically a electric heater level and if works at all.

IIRC, cold climate specific (Mitsubishi Zubadan series for example) have COP of about ~2 at -20C. Even cheaper cold climate pumps do function at -30, albeit with COP barely above 1. So resistive heater should also be present, but it won't be used often.

Not true. Inverter heat pumps can do 8 or more btu per watt at sub zero temps.

outside, just like residential heat pumps.