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A Personal Story on the Dangers of Carbon Monoxide

Ask This Old House plumbing and heating expert Richard Trethewey shares a personal story on the dangers of carbon monoxide and how an operational CO detector could be the difference between life and death..


  1. Ideally, a carbon monoxide detector should be installed on every level of the home. It’s especially important to place one near combustion appliances like a furnace, water heater, gas stove, or gas fireplace.
  2. Ensure batteries are changed twice per year, even on models that are hardwired or plugged in to an outlet.
  3. Replace the entire carbon monoxide detector every five years.