Carbon monoxide attaches itself to hemoglobin and displaces the oxygen that the body organs need. Carboxyhemoglobin can cause headaches, fatigue, nausea, dizzy spells, confusion and irritability. Later stages of CO poisoning can cause vomiting, loss of consciousness and eventually brain damage or death. Carbon monoxide is a by-product of combustion of fossil fuels. Carbon monoxide usually is vented to the outside if appliances function correctly and the home is vented properly.
Problems occur when furnace heat exchanger crack or vents and chimneys become blocked.
Insulation sometimes can trap CO in the home. The Consumer Product Safety Commission and the Phoenix Fire Department recommend installing at least one carbon monoxide detector with an audible alarm near the bedrooms. If a home has more than one story, a detector should be placed on each story. Be sure the detector has a testing laboratory label. Measure the concentration of carbon monoxide in the flue gases.