Published March 7, 2026

Carbon Monoxide Risks in Rochester Homes During Heating Season

Carbon monoxide (CO) is called the silent killer because it is colorless, odorless, and lethal at elevated concentrations. Rochester's long heating season — typically October through April — means furnaces, boilers, water heaters, and fireplaces run extensively, creating sustained CO risk if systems malfunction or are improperly maintained.

Common CO Sources in Rochester Homes

The primary sources of carbon monoxide in residential settings include cracked heat exchangers in furnaces, blocked or disconnected flue pipes, improperly vented water heaters, malfunctioning gas fireplaces and inserts, attached garage vehicle exhaust entering living spaces, and portable generators used during power outages. Our HVAC inspection specifically evaluates combustion appliances for CO safety.

Heat Exchanger Failures

The heat exchanger is the most critical safety component in a gas furnace. When it cracks, combustion gases including CO can mix with heated air distributed throughout the home. Heat exchanger cracks are more common in furnaces over 15 years old and in units that have been inadequately maintained. We use visual inspection and, when warranted, recommend combustion analysis testing to evaluate heat exchanger integrity.

CO Detector Requirements

Minnesota law requires carbon monoxide detectors within 10 feet of every sleeping area in homes with fuel-burning appliances or attached garages. During inspection, we verify proper CO detector placement, test functionality, and note any gaps in coverage. CO detectors have a limited lifespan (5-7 years) and should be replaced according to manufacturer recommendations regardless of whether they appear functional.

Prevention Strategies

Annual professional furnace maintenance is the most effective CO prevention measure. Ensure all fuel-burning appliances are properly vented, never operate gas-powered equipment indoors or in attached garages, maintain CO detectors on every level, and schedule regular home inspections that include combustion safety evaluation.