Is Sweden using an unsustainable amount of heaters to fight against deadly winter temperatures? Air conditioning is much more efficient than a heater. Arizona w

Is Sweden using an unsustainable amount of heaters to fight against deadly winter temperatures? Air conditioning is much more efficient than a heater. Arizona will usually only get more than 15 degrees warmer than a comfortable indoor temperature. In places with cold winters, sometimes temperatures will get more than 25 degrees cooler than a comfortable indoor temperature.