Best Combined Smoke and Carbon Monoxide Alarms Updated May 2026

Join the millions that have trusted BuyersGuide.org to help them make smarter buying decisions. Let our independent expert reviews and data-driven shopping recommendations help you find the one that's right for you.

Best Combined Smoke and Carbon Monoxide Alarms
2026 Buyer's GuideUpdated May 2026
Sort by:
1

10.0

Kidde Smoke and Carbon Monoxide Detector, 10-Year Battery Powered, LED Status Lights, 85 dB Alarm, 5-inches, 30CUD10, 1 Pack
Installation

10.0

1
Kidde Smoke and Carbon Monoxide Detector, 10-Year Battery Powered, LED Status Lights, 85 dB Alarm, 5-inches, 30CUD10, 1 Pack
Installation

10.0

1
Kidde Smoke and Carbon Monoxide Detector, 10-Year Battery Powered, LED Status Lights, 85 dB Alarm, 5-inches, 30CUD10, 1 Pack
Installation
2

9.8

First Alert SMCO210, 10-Year Sealed Battery Combination Smoke & Carbon Monoxide Alarm with Slim Profile Design, 1-Pack
Ease of installation

9.8

2
First Alert SMCO210, 10-Year Sealed Battery Combination Smoke & Carbon Monoxide Alarm with Slim Profile Design, 1-Pack
Ease of installation

9.8

2
First Alert SMCO210, 10-Year Sealed Battery Combination Smoke & Carbon Monoxide Alarm with Slim Profile Design, 1-Pack
Ease of installation
3

9.5

First Alert BRK Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMICO100, 1-Pa...
Ease of installation
Functionality

9.5

3
First Alert BRK Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMICO100, 1-Pa...
Ease of installation
Functionality

9.5

3
First Alert BRK Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMICO100, 1-Pa...
Ease of installation
Functionality
4

9.4

First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack
Replacement
Installation

9.4

4
First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack
Replacement
Installation

9.4

4
First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack
Replacement
Installation
5

9.2

First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup - 3 Pack
Replacement
Installation

9.2

5
First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup - 3 Pack
Replacement
Installation

9.2

5
First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup - 3 Pack
Replacement
Installation
6

9.1

Kidde Smoke Detector & Carbon Monoxide Detector Combo with 10-Year Battery,‎White
Ease of installation

9.1

6
Kidde Smoke Detector & Carbon Monoxide Detector Combo with 10-Year Battery,‎White
Ease of installation

9.1

6
Kidde Smoke Detector & Carbon Monoxide Detector Combo with 10-Year Battery,‎White
Ease of installation
7

8.9

First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup, 6-Pack
Replacement
Installation

8.9

7
First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup, 6-Pack
Replacement
Installation

8.9

7
First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup, 6-Pack
Replacement
Installation
8

8.7

Kidde Smoke and Carbon Monoxide Detector, AA Battery Powered with LED Status Lights, 85 dB Alarm, 5 inches, 30CUDR, 1 Pack
Installation
Quality
Value for money

8.7

8
Kidde Smoke and Carbon Monoxide Detector, AA Battery Powered with LED Status Lights, 85 dB Alarm, 5 inches, 30CUDR, 1 Pack
Installation
Quality
Value for money

8.7

8
Kidde Smoke and Carbon Monoxide Detector, AA Battery Powered with LED Status Lights, 85 dB Alarm, 5 inches, 30CUDR, 1 Pack
Available in:  2 styles 2 sizes
Installation
Quality
Value for money
9

8.5

First Alert SC5 Battery Smart Smoke & Carbon Monoxide Alarm, SMCO600NV, 1-Pack
Easy to install
Replacement

8.5

9
First Alert SC5 Battery Smart Smoke & Carbon Monoxide Alarm, SMCO600NV, 1-Pack
Easy to install
Replacement

8.5

9
First Alert SC5 Battery Smart Smoke & Carbon Monoxide Alarm, SMCO600NV, 1-Pack
Available in:  2 styles
Easy to install
Replacement
10

8.3

Kidde Smoke & Carbon Monoxide Detector, AA Battery Powered, LED Warning Light Indicators, 2 Pack
Installation
Quality
Value for money
Safety

8.3

10
Kidde Smoke & Carbon Monoxide Detector, AA Battery Powered, LED Warning Light Indicators, 2 Pack
Installation
Quality
Value for money
Safety

8.3

10
Kidde Smoke & Carbon Monoxide Detector, AA Battery Powered, LED Warning Light Indicators, 2 Pack
Installation
Quality
Value for money
Safety

Our Top Choice

1

10.0

Kidde Smoke and Carbon Monoxide Detector, 10-Year Battery Powered, LED Status Lights, 85 dB Alarm, 5-inches, 30CUD10, 1 Pack
Installation

10.0

1
Kidde Smoke and Carbon Monoxide Detector, 10-Year Battery Powered, LED Status Lights, 85 dB Alarm, 5-inches, 30CUD10, 1 Pack
Installation

10.0

1
Kidde Smoke and Carbon Monoxide Detector, 10-Year Battery Powered, LED Status Lights, 85 dB Alarm, 5-inches, 30CUD10, 1 Pack
Installation

Choosing between many options can be difficult. This guide compiles essential product details, feature comparisons, and up-to-date market data into a single, easy-to-scan view. Rankings are determined by performance factors, product popularity, and continuous analysis across available models, making it simple to compare and select the right fit. Results come from side-by-side comparisons within each category, highlighting the features that matter most. Rankings are refreshed regularly as new data and shopping trends evolve, helping surface strong-performing products and keep recommendations current.