Chimneys must be checked to see that they are not blocked by birds' nests, snow, or other obstacles. A wood fire should be stirred before being left overnight, so it will burn down efficiently. When as open wood fire is going, a window should always be kept cracked open, especially in a tightly sealed house. Choose vented appliances whenever possible. They are not meant to be a primary source of heat and should be used only in a well-ventilated room.
Some states now ban the sale of kerosene heaters for home use.
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