A Lewisville family nearly died from carbon monoxide poisoning after they turned on their heat.
The family is recovering in the hyperbaric medicine unit at Presbyterian Hospital after their furnace malfunctioned.
The family was found nearly unconscious.
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Because the gas is odorless, tasteless, and colorless, investigators recommend families have a carbon monoxide detector in their home. It is also a good idea to have the furnace and chimney checked before using them this year.