Carbon monoxide is a gas you cannot see or smell, so in a St. Charles home an alarm is the only reliable way to know it is present. This guide covers where alarms belong, how to check the ones you already have, and what to do when one sounds.
Where carbon monoxide comes from
Carbon monoxide forms when fuels such as natural gas, propane, oil, wood, or gasoline do not burn completely. In a typical house, the usual sources are:
- A furnace, water heater, or other gas-fired appliance
- A gas range or oven
- A gas dryer
- A fireplace or wood stove
- An attached garage where a vehicle has been running
- A generator or outdoor grill that has been moved or used indoors
Whatever the layout of your St. Charles home, walk each level and list every fuel-burning appliance you have. That list tells you where the alarms should be.
Check the alarms you already have
Start with what is installed now. Look for these details on each unit:
- A certification mark from a recognized testing laboratory
- An end-of-life date printed on the back or side of the unit
- A test button that makes a loud sound when pressed
- A battery type that matches the manufacturer's instructions, if the unit is battery powered
If an alarm is past its end-of-life date, replace it. Alarms do not last forever, and an old unit may not respond the way a new one does.
Where alarms belong
Placement follows a few common rules, but the printed instructions that came with your alarm control the exact height and distances. In general:
- Install an alarm on every level of the home, including the basement.
- Place alarms outside each separate sleeping area so the sound reaches people while they sleep.
- Keep alarms away from fuel-burning appliances, following the distance in the manual.
- If the home has an attached garage, mount the alarm inside the house near the garage door, not inside the garage itself.
- Avoid spots where a supply register blows air directly at the alarm, since moving air can interfere with the sensor.
Test and maintain the alarm
Testing takes less than a minute and is the simplest habit in this guide.
- Press the test button monthly and confirm the alarm sounds.
- Replace batteries when the unit signals low power, and at least once a year if the manufacturer recommends it.
- After a power outage, check that each alarm is still working and has reset properly.
- Keep dust and paint off the unit so the openings stay clear.
What to do when an alarm sounds
A steady alarm is different from a single chirp that repeats every so often. A chirp usually means a low battery or an end-of-life warning. A steady alarm means the unit has detected carbon monoxide, and it should be treated as an emergency even if nobody in the house feels unwell.
- Move everyone outside to fresh air right away, including pets.
- Call the fire department or your local emergency number from outside the home.
- Do not go back inside until emergency responders say it is safe.
- Once the home is cleared, have a qualified service technician check the furnace, water heater, and any other fuel-burning appliance before anyone uses them again.
A yearly habit for St. Charles homeowners
Pick one day each year to walk the home with this checklist. Confirm that every level has an alarm, that each unit is within its end-of-life date, and that the test button works. Note any appliance that has changed, such as a new generator or a relocated grill, and make sure the alarms still cover it. A few minutes of attention once a year is the most practical way to keep a St. Charles home's carbon monoxide protection in working order.