Homeownership

Where Should I Put CO Detectors?

Patrick Kevin FaganPatrick Kevin Fagan Texas Real Estate Sales Agent #454749, AXEN Realty LLC · Senior Loan Officer, NMLS ID #877741, NEXA Mortgage, LLCUpdated October 9, 2026

Carbon monoxide is the quiet danger in a Texas home: it is colorless, odorless, and produced by any appliance that burns gas or fuel, including furnaces, water heaters, fireplaces, and portable generators. The CDC recommends CO alarms near every sleeping area, and the CPSC recommends them on every level of the home. Because symptoms mimic the flu, the alarm is often the only warning you get. Let's place them right, Patriot Nation, and make it a great one.

Quick Answer

Put a CO detector on every level, outside each sleeping area, and near fuel-burning appliances. Test monthly, change batteries on the clock change, and replace the unit per the manufacturer's dates.

Ask Patrick where to put CO detectors.

Where They Belong

Install one on each floor, outside the sleeping areas, and inside rooms with fuel-burning appliances such as the furnace closet, water heater, or attached garage. Avoid placing them within a few feet of kitchens, humid bathrooms, or vents where false alarms are common.

The placement rule is simple: the alarm belongs where people sleep and where fuel burns. A detector in the hallway outside the bedrooms wakes the family, and that is the one that matters most when the furnace has a problem at 2 a.m.

Texas-Specific Risks

Natural gas is the most common home heating fuel in San Antonio, and winter storms push many families to portable generators. Generators must run outdoors, at least 20 feet from doors, windows, and vents, because their exhaust creates deadly CO in minutes. A CO alarm is the one device that turns that invisible risk into a warning.

The Texas winter storm pattern is exactly when CO calls spike: the power goes out, the generator comes out, and the exhaust finds its way inside. Run the generator far from the house, never in the garage, and let the alarm be your second line of defense, not your first.

Testing and Replacement

Test each unit monthly with the test button and replace batteries when you change the clocks. CO alarms have a service life, usually five to seven years, printed on the back, so replace the whole unit on schedule instead of assuming an old detector still works.

The test button confirms the alarm sounds, and the date on the back confirms the unit is still in its service life. Both checks take one minute a month, and both are the difference between a detector that saves you and a detector that is just decoration.

For Buyers: Check the Detectors Before You Close

When you tour a home, note where the CO detectors are and ask their age. Texas homes with fuel-burning appliances should have working units on every level, and a home that is light on detectors is a home you can fix on day one for a small cost.

Detectors are cheap, and the installation is a weekend project, so do not let a missing unit kill a deal. Just budget for it, buy the units, and place them the day you get the keys, because the first cold night is not the time to discover the furnace shares its room with a sleeping family and no alarm.

Patrick's Advice: Make It a Great One

Put a detector on every level, outside every sleeping area, and near every fuel-burning appliance, then test monthly and replace on the date on the back. The families who check their detectors are the ones who never learn what carbon monoxide smells like, because it does not smell at all. Ask Patrick to help you plan your CO detector placement.

Ask Patrick about CO detector placement

Get a straight answer on where carbon monoxide detectors belong and how to keep your family safe.

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Patrick's Take

"Put a CO detector on each floor, outside the sleeping areas, and near rooms with fuel-burning appliances, and keep it away from kitchens and humid bathrooms. Placement decides whether it wakes you up."
PF
Patrick Kevin Fagan

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Answered by Patrick Kevin Fagan

Texas Real Estate Sales Agent #454749, AXEN Realty LLC · Senior Loan Officer, NMLS ID #877741, NEXA Mortgage, LLC

Call or text: 210-317-6514