Chopper 6 HD was over the 2000 block of Spinnerstown Road near Quakertown.
Officials were called to a duplex around 9:30 a.m. for a report of high carbon monoxide levels.
There they found one person unconscious, and another semi-conscious.
Rescue crews were able to revive them before taking them to the hospital to be checked out.
The cause of the leak is under investigation.