I use my 15 year old Panasonic heatpump down to -20 C. Add some wood to the fire on the coldest days. Works great although the «free energy» is really low at t

I use my 15 year old Panasonic heatpump down to -20 C. Add some wood to the fire on the coldest days. Works great although the «free energy» is really low at those temperatures.