I was almost killed in a friend's house a few times because of a bad furnace. I used to sleep over there and I noticed I woke up with a hangover (for a lack of a better term) and I noticed a bad taste in my mouth a few times. I was just a kid but I always suspected it was an air quality problem. I started sleeping near an open window when I was there even in the winter.
They had the furnace serviced some time later and the "gas man" condemned it because he had a cracked heat exchanger.
I have a hard time describing what CO poisoning feels like but I will never forget it. It is like you are breathing cotton or something. Your lungs are taking in air but it isn't working for you.
I am pretty happy that I am "all electric" here.
