Defective furnaces are a  source for Carbon Monoxide poisoning. Carbon Monoxide is a colorless, odorless gas that is heavier than air. A highly poisonous gas that  acts by replacing oxygen in the bloodstream when it is breathed.  Carbon Monoxide poisoning symptoms can include a red face, headache, and fatigue. When  you are fast asleep you don’t even notice these symptoms which lead to coma and death. Have your HVAC system checked out every year to make sure it’s running at top performance.  Call Premier Air Colorado at 303-993-9060 for all your heating and cooling needs and visit them online at www.premieraircolorado.com to learn more and check out their monthly specials.