HVAC ANSWERS · COOLING AND HEATING PROBLEMS
Carbon-monoxide alarms and gas odors
Canonical HVACentric knowledge for all questions on this topic.
DIRECT ANSWER
Carbon monoxide is colorless and odorless, so do not use smell to judge whether it is present. If a carbon-monoxide alarm sounds, follow the alarm and emergency guidance and move to fresh air; if you smell or hear leaking gas, leave immediately and contact the gas authority or emergency services from outside without operating switches or electronics. Contractor research comes only after the immediate safety risk is addressed.
Questions this topic covers
These are examples of natural wording that map to this maintained topic. They are not separate pages or duplicate answers.
- What should I do if the carbon-monoxide alarm sounds?
- I smell gas near the furnace.
- Can you smell carbon monoxide?
- Is a rotten-egg odor an HVAC problem?
- Should I call an HVAC contractor first for a gas leak?
Sources used for this answer
HVACentric uses public primary and authoritative sources as research anchors. Property-specific decisions still require direct verification.