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Top rated carbon monoxide detectors

AI-generated summary · updated July 27, 2026 · verify details before purchase.

  1. Best overall

    Kidde KN-COB-DP2 Battery-Operated Carbon Monoxide Detector

    4.6/5 $25-$35

    Reliable battery-operated CO detector with digital display and peak level memory, highly rated for its accuracy and ease of use.

    • Digital display
    • Peak level memory
    • Battery powered
    • No voice alerts
  2. Best value

    First Alert CO600 Plug-In Carbon Monoxide Detector

    4.5/5 $20-$30

    Affordable plug-in CO detector with battery backup, simple operation and solid reliability.

    • Battery backup
    • Easy installation
    • Budget-friendly
    • No digital display
  3. Best smart detector

    Nest Protect (2nd Gen) Smoke and Carbon Monoxide Detector

    4.7/5 $100-$130

    Smart alarm with voice alerts, self-test, and app notifications; combines smoke and CO detection.

    • Smart features
    • Voice alerts
    • App integration
    • Expensive
    • Requires Wi-Fi
  4. Best hardwired combo

    Kidde KN-COSM-IBA Hardwired Smoke and Carbon Monoxide Detector

    4.5/5 $40-$55

    Hardwired dual-sensor smoke and CO detector with battery backup, ideal for interconnected systems.

    • Hardwired
    • Smoke and CO
    • Battery backup
    • Installation requires wiring
  5. Best combination

    First Alert SC9120B Hardwired Smoke and Carbon Monoxide Detector

    4.6/5 $35-$45

    Hardwired combination smoke and CO alarm with electrochemical sensor for accurate CO detection.

    • Combination detection
    • Electrochemical sensor
    • Battery backup
    • No voice alerts
  6. Best budget pick

    X-Sense XC01 Battery-Operated Carbon Monoxide Detector

    4.4/5 $15-$25

    Ultra-affordable CO detector with LCD display and 7-year sensor life, great for tight budgets.

    • Low cost
    • LCD display
    • Long sensor life
    • Basic features

Buying advice

When choosing a carbon monoxide detector, consider power source (battery, plug-in, or hardwired), sensor accuracy (electrochemical is best), and extra features like digital display, voice alerts, or smart home integration. Ensure it meets UL standards and has a loud alarm. Place near sleeping areas and on each level of your home.

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