It's much better and cheaper to just turn up the thermostat on your forced air furnace than it is to use electric space heaters to heat your home with.
Now if you're trying to heat just one room per day using an electric space heater then that can run your electric bill up to $100.00 per month just to barely stay warm in one room especially in the frigid cold weather.
Space heaters are meant to be used as supplemental heat sources and are not meant to be a sole heat source.
Also never plug a space heater into an extension cord as you risk overheating the wire and causing a fire.
Heating my home with natural gas forced air furnace costs me at most $150.00 per month so if I tried to heat two rooms with 2 space heaters my electric bill would be $200.00 per month so I'd be spending $50.00 more per month to barely stay warm.
It's much cheaper to just turn the thermostat on the central heat up and heat the whole house.