1) Have your heating system serviced professionally to make sure that it is clean, working properly and ventilated to the outside.
2) Inspect and clean fireplaces and chimneys.
3) Install a smoke detector. Test batteries monthly.
4) Have a safe alternate heating source and alternate fuels available.
5) Prevent carbon monoxide (CO) emergencies.
6) Install a CO detector to alert you of the presence of the deadly, odorless, colorless gas. Check batteries regularly.
7) Learn symptoms of CO poisoning: headaches, nausea, and disorientation.
(Information provided by the Center for Disease Control)