COMBUSTION & CARBON MONOXIDE
What was I measuring in your furnace flue?
A combustion analyzer samples the exhaust while the furnace runs. It reads carbon monoxide, oxygen and flue temperature — telling us whether the burner is burning cleanly and the exhaust is leaving the house. CO has no color or smell, so a measurement is the only way to know.
WHAT TO LOOK FOR
Signs you might notice.
- A CO alarm that chirps or sounds (get outside and call 911 from outside first)
- Headaches or flu-like symptoms that ease when you leave home
- Soot, a yellow or lazy flame, or rust around the furnace vent
WHAT WE DO ABOUT IT
Every fall maintenance includes combustion analysis and clocking the gas meter. The readings go in your report. We also install low-level CO monitors that show readings well below what a standard alarm reacts to.
PICTURES & VIDEO
Photos and short videos from real Hampton Roads homes are being added to this page. Ask during your visit — we are happy to show you on your own system.
GO DEEPER
Guides on this topic.
Carbon monoxide & home safety
Understand the sources, recognize the limits of symptoms and alarms, and know when to leave immediately.
Reviewed Oct 2, 2026Read the guideHomeowner guidesLow-level carbon monoxide: what your alarm may not tell you
A silent alarm does not establish zero CO. Understand alarms, supplemental monitors, and model-specific alerts.
Reviewed Oct 2, 2026Read the guideHomeowner guidesWhat happens during a combustion safety evaluation?
Understand the questions, equipment checks and documentation to discuss before a non-emergency visit.
Reviewed Oct 2, 2026Read the guideHomeowner guidesTold you have a cracked heat exchanger?
A serious finding deserves clear evidence, an explanation, and appropriate action.
Reviewed Oct 2, 2026Read the guideFOR TECHSFIELD NOTES
OTHER TOPICS
CARE WITH A CLEAR RECORD
Know your system.
Plan its care.
Explore maintenance, the measurements behind our recommendations, and what to confirm before joining a plan.
YOUR LOCAL COMFORT TEAM