10/24/2026
Carbon monoxide detectors are a crucial last line of defense, but waiting for the alarm to sound means gas levels are already dangerously high. At Glendale Heating, we want to help you spot the early physical warning signs of a furnace leak before it becomes an emergency.
The risk is highest during the first fall startup when dormant, rusted, or cracked parts are suddenly put under stress.
Read our latest guide to learn what visual clues to look for and when you need to shut down your system immediately.
See how to tell if your furnace is leaking carbon monoxide before the alarm sounds. Spot early visual warning signs this fall and know when to call a pro.