Best combination gas and carbon monoxide detectors, ranked

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AI-generated summary · updated October 17, 2026 · verify details before purchase.

1. 1 Best overall

   Nest Protect 2nd Generation

   ★★★★★4.8/5 $120-$140

   Smart detector with voice alerts, Wi-Fi, and app integration.

   • Smart alerts
   • Wi-Fi connectivity
   • Battery + plug-in

   • Higher price

   View on Amazon manufacturer site
2. 2 Best value First Alert

   First Alert CO-200 Combination Gas/Smoke Detector

   ★★★★☆4.5/5 $20-$25

   Dual sensor, battery-powered, easy installation.

   • Affordable
   • Dual sensor
   • Battery powered

   View on Amazon manufacturer site
3. 3 Best budget pick First Alert

   First Alert CO-7 Combination Gas/Smoke Detector

   ★★★★☆4.4/5 $18-$22

   Compact, dual detection, battery backup.

   • Compact design
   • Battery backup
   • Dual detection

   • No Wi-Fi

   View on Amazon manufacturer site
4. 

   4 Best for older homes Kidde

   Kidde KN-COA-3 Combination Gas/Smoke Detector

   ★★★★☆4.3/5 $57.47

   Battery-powered, easy to install, affordable.

   • Battery powered
   • Easy install
   • Affordable

   • No smart features

   View on Amazon manufacturer site
5. 5 Great mid-range option First Alert

   First Alert CO-150 Combination Gas/Smoke Detector

   ★★★★☆4.2/5 $30-$35

   Dual sensor, long battery life, clear indicator LED.

   • Long battery life
   • Dual sensor
   • Clear LED

   • Slightly bulkier

   View on Amazon manufacturer site

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