Only a handful of states explicitly require carbon monoxide detectors in hotels by statute. California, Delaware, and Florida all have laws on the books mandating CO detection in lodging establishments, though the specifics of each law differ significantly. Most other states rely on building codes, fire codes, or local ordinances rather than statewide hotel-specific mandates, which means coverage is uneven across the country.
States With Explicit Hotel CO Detector Laws
California has one of the broadest requirements. State law (Health & Safety Code § 17926) requires the owner of every hotel and motel dwelling unit intended for human occupancy to install and maintain a carbon monoxide detection device. This applies regardless of building age, making California one of the most protective states for hotel guests.
Delaware requires owners of lodging establishments to install carbon monoxide detection devices under Title 16 § 6602C. The law covers hotels, motels, and similar accommodations.
Florida takes a more targeted approach. Under Statute § 509.211, any enclosed space in a public lodging establishment that contains a fuel-fired boiler and also has sleeping rooms in the same building must have CO detectors. Those detectors must be integrated with the hotel’s fire detection system or connected to a control unit that can shut down the boiler automatically when carbon monoxide is detected. Florida also has a separate statute (§ 553.885) requiring CO alarms in any new construction permitted after July 2008 that has a fossil-fuel-burning heater, appliance, fireplace, or attached garage. In those buildings, alarms must be installed within 10 feet of each sleeping room.
Why the List Is Shorter Than You’d Expect
Many states require CO detectors in residential buildings, including apartments and single-family homes, but don’t extend those same requirements to commercial lodging. In those states, hotels may still be required to install CO detectors through other channels: adopted building codes (like the International Building Code), fire codes, or local municipal ordinances. A city or county can impose stricter requirements than the state, so a hotel in Denver might have different obligations than one in rural Colorado, even if the state statute doesn’t specifically mention hotels.
The National Fire Protection Association’s Life Safety Code (NFPA 101) has added carbon monoxide detection requirements in recent editions, but those additions have focused primarily on new healthcare and ambulatory care facilities with fuel-fired appliances. Hotels aren’t yet covered under the same provisions, though many jurisdictions adopt NFPA standards as part of their local fire codes and may apply them more broadly.
What Triggers the Requirement
In most jurisdictions, the presence of a fuel-burning appliance is what triggers the CO detector requirement. If a hotel uses natural gas furnaces, propane water heaters, oil-fired boilers, or has an attached parking garage where vehicle exhaust can enter, CO detection is typically required. All-electric buildings with no attached garages often fall outside these mandates because they don’t produce combustion byproducts.
Federal housing standards from HUD offer a useful reference point for where detectors should go. They call for CO alarms in the immediate vicinity of each bedroom (or inside the bedroom itself) when a fuel-burning appliance is present anywhere in the unit. If a forced-air furnace is located elsewhere in the building but serves the sleeping area through ductwork, alarms should be placed near bedrooms or at the first duct register. Buildings with shared mechanical rooms, laundry facilities, or attached garages also need detectors positioned between those spaces and any sleeping areas.
Hotels vs. Short-Term Rentals
Traditional hotels are generally held to stricter safety standards than short-term rentals listed on platforms like Airbnb. Hotels must meet fire and safety codes that include posted escape routes, fire doors, sprinkler systems, and smoke detectors. Research from the Johns Hopkins Bloomberg School of Public Health found that many Airbnb listings in the United States lack basic safety protections, including carbon monoxide detectors, that would be legally required of a hotel in the same location.
Short-term rentals are only required to comply with local statutes and codes, which vary widely between municipalities. Some cities have adopted ordinances requiring CO detectors in all rental properties, while others have no such rules. Airbnb provides free CO detectors to hosts who request them, but installation is voluntary in many areas. If you’re booking a short-term rental, checking whether the listing mentions a CO detector is worth doing before you arrive.
What This Means as a Guest
If you’re staying in a hotel in California, Delaware, or Florida, CO detectors should be present. In other states, coverage depends on local codes, the type of heating system in the building, and how aggressively the local fire marshal enforces standards. Newer hotels built under recent building codes are more likely to have detectors than older properties.
Portable, battery-operated CO detectors designed for travel are widely available and cost between $20 and $40. They’re small enough to fit in a carry-on bag. Given that CO is colorless and odorless, and that poisoning symptoms (headache, dizziness, nausea) are easy to mistake for the flu or altitude sickness, a travel detector is a reasonable precaution for anyone who stays in hotels frequently or books older properties.