Use your fireplace
Fireplaces are notoriously inefficient heat sources, as lots of heat goes up the chimney. But in an emergency, you can keep warm by a fire if you have enough wood to burn. A gas fireplace works too, and is more efficient than a woodburning fireplace.
Little drafts around doors and windows go unnoticed when the furnace is operating. But when the power’s out, these drafts really bring on the chill. Block drafts with towels.
Note: Don’t block drafts if you’re running a fuel-powered heater. These small air intrusions help the heaters burn efficiently and provide ventilation.
Preheat your home
If you have advance warning, set the thermostat higher than usual and heat typically unused spaces to boost thermal mass.
Keep doors closed
Opening a door to the cold lets out a lot of heat. Limit trips in and out of the house, opening doors only when necessary.
Propane and kerosene heaters produce carbon monoxide just as gas stoves, ovens and fireplaces do. When running any fuel-powered heat appliance during a power outage, it’s imperative to have operating battery-powered carbon monoxide and smoke detectors. Read and adhere to all of the heater manufacturer’s warnings. Indoor-safe propane or kerosene heater
Propane or kerosene heaters are safe for indoor use only if they’re labeled “indoor-safe” and you follow the manufacturer’s instructions. They come in different sizes to suit the area to be heated. These portable heaters are available at home centers and online, ranging in price from $80 to $500. Manufacturers recommend opening a window an inch or so when using these heaters, particularly in a super-insulated home. If you’re using a fuel-powered heater in a very small room, open a door to an adjoining room.