Despite the scare, the situation could have been a lot worse.
“Anytime you see something like that, you’re always worried, you know, that it could be something fatal,” Steve Madden, a neighbor of the family, said.
"It's scary because you can't smell it, you can't see it, you know the alarm did go off," said Jason Nali.
The State Fire Marshal says heating is the No. 1 cause of elevated carbon monoxide levels inside a home, which is why this time of the year poses the most danger.
To avoid a CO scare, you should check your detectors every few years and give your furnace a tune-up before turning your heat on for the first time in the season.
Nali says he's just thankful his family made it out alive, and is now hoping his uncle will recover soon.