Besides the matter of heat pumps which others have covered, there is also the matter of how good your heating system is at getting heat to where you actually ne

Besides the matter of heat pumps which others have covered, there is also the matter of how good your heating system is at getting heat to where you actually need it. A PC under your desk will keep your toes warm, and maybe with warm toes you don't really mind the rest of the house being at 10 C / 50 F. With such space heater, you can turn down the thermostat for the entire house and only heat the parts you care about most. Furthermore there are radiative space heaters which direct infrared energy to a specific part of the room using a reflective dish, instead of heating the entire room using convection. In large rooms, radiative space heater can keep you feeling warm while using much less energy than a heatpump would require to heat the whole room.