Keep all rooms safely above freezing, +10 Celsius/ +50F and only heat one room warmer. Calculate the power/fuel you would use then and compare to full central heating (it can be different for every location). Generally speaking in many countries running something that heats or cooles rooms with electricity 24/7 will make your power bill skyrocket. Damage to property caused by the cold like burst pipes and other stuff can certainly cost you any savings made and more.
Keep all rooms safely above freezing, +10 Celsius/ +50F and only heat one room warmer. Calculate the power/fuel you would use then and compare to full central heating (it can be different for every location). Generally speaking in many countries running something that heats or cooles rooms with electricity 24/7 will make your power bill skyrocket. Damage to property caused by the cold like burst pipes and other stuff can certainly cost you any savings made and more.