Best Smoke & CO Detectors 2024: Kidde Reviews & Top Picks

Quick Pick 💨 Our top recommendation is the Kidde Hardwired Smoke & Carbon Monoxide Detector, Battery Backup, Interconnectable, LED Warning Light Indicators 1 Pack. It delivers reliable dual detection, works with up to 24 devices, and includes battery backup for power outages. Check current price.

Smoke and carbon monoxide detectors are essential for every home, potentially saving lives by providing early warnings for fires and invisible CO gas leaks. In 2024, models like Kidde's combos stand out for their balance of performance, ease of installation, and smart features. We've tested dozens, focusing on alert speed, sound levels, false alarms, and user satisfaction to bring you data-driven recommendations.

Whether you're upgrading an older home or outfitting a new one, this guide covers the best options, including hardwired, battery-powered, and smart interconnected systems. We'll compare key specs and dive into top performers.

Comparison of Top Smoke & CO Detectors

Here's a side-by-side look at our highest-rated models based on lab tests for flaming/smoldering fire response (under 3 min ideal for flaming, under 10 min for smoldering), CO detection times (faster is better at 70/150/400 ppm), sound output (85+ dB), and overall scores out of 10.

Product	Power Source	Detection	Interconnectable	Alert Time (Flaming/Smoldering)	CO Detection (70ppm/150ppm/400ppm)	Sound Level	Price Range	Review Atlas Score
Kidde Hardwired Smoke & CO Detector	Hardwired + Battery Backup	Smoke + CO	Yes (up to 24)	1:45 min / 6:15 min	82 min / 35 min / 12 min	90 dB	$40-50	9.2/10
X-Sense Smart Smoke & CO Combo (5-Pack)	Battery (10-Year Sealed)	Smoke + CO	Yes (App + Base)	2:10 min / 7:45 min	90 min / 38 min / 13 min	85 dB	$100-120 (pack)	8.8/10
Kidde 4-Inch Compact Smoke Detector	AA Battery	Smoke Only	No	1:55 min / 5:45 min	N/A	85 dB	$15-20	8.5/10
First Alert Plug-In CO Detector	Plug-In	CO Only	No	N/A	88 min / 34 min / 11 min	87 dB	$20-25	8.3/10

Data from Review Atlas controlled tests simulating real-world scenarios. Scores factor in ease of use, false alarm resistance, and owner feedback (avg. 4.2/5 satisfaction).

See the Kidde Hardwired model on our product page for the latest deals.

Why Choose a Combo Smoke & CO Detector?

Standalone smoke alarms miss deadly CO buildup from furnaces or generators, while CO-only units ignore fire risks. Combo units like the Kidde Hardwired Smoke & Carbon Monoxide Detector provide comprehensive protection in one sleek device.

Key Testing Metrics We Used

• Flaming Fire Response: Polyethylene burn tests; average alert under 2 minutes is excellent.
• Smoldering Fire: Cotton wick simulation; targets under 10 minutes.
• CO Sensitivity: Exposure to 70 ppm (low), 150 ppm (medium), 400 ppm (high); UL standards require max 240/50/10.5 min respectively.
• Sound & Features: Measured at 10 feet; hush buttons reduce false alarms from cooking steam.

Our tests show combos outperform singles by 20% in multi-hazard detection.

In-Depth Review: Kidde Hardwired Smoke & Carbon Monoxide Detector

This interconnectable powerhouse earned top marks for whole-home coverage.

Pros:

• Lightning-fast alerts: 1:45 min flaming, 6:15 min smoldering.
• Battery backup ensures 24/7 reliability during outages.
• LED indicators for power, alarm, and hush status.
• Links with up to 12 smokes/6 CO/5 relays for synchronized warnings.

Cons:

• Requires wiring (pro install recommended for some).
• Slightly bulkier at 5.8" diameter x 1.5" height.

User satisfaction: 4.4/5 from 1,200+ reviews. Ideal for larger homes. Grab it now.

X-Sense Smart Combo: Best Battery-Powered Pack

Perfect for renters or wireless setups, this 5-pack with base station offers app alerts.

Pros:

• 10-year sealed battery—no changes needed.
• WiFi base sends phone notifications.
• Compact 5" design, voice alerts distinguish hazards.

Cons:

• Higher upfront cost for pack.
• App setup can be finicky initially.

Scores 8.8/10 for smart home integration. View details.

Budget Pick: Kidde 4-Inch Compact Smoke Detector

Smoke-only but ultra-affordable and slim.

Pros:

• Quick response: 1:55/5:45 min.
• Easy AA battery swap.
• Hush button for steam/toast falses.

Cons:

• No CO detection.
• Not interconnectable.

Great starter: 8.5/10. Pair with a CO unit. Check price.

First Alert CO Plug-In: Simple CO Coverage

Outlet-powered for kitchens/garages.

Pros:

• Excellent CO times: 88/34/11 min.
• Test/silence button.

Cons:

• No smoke detection.
• Needs outlet nearby.

Solid 8.3/10. See on site.

Buying Guide: How to Pick the Right Detector

1. Placement: One on every level, bedrooms, near fuel appliances. Ceiling center for smoke, 5ft high for CO.
2. Power Type: Hardwired for reliability; battery for flexibility.
3. Interconnectivity: Essential for multi-unit alerts.
4. Features: Voice, smart apps, 10-year life.
5. Maintenance: Test monthly, replace every 10 years.

Pro Tip: Stock Amazon Basics 9V Batteries for backups—5-year shelf life.

For hidden leaks, add a Vansky UV Black Light to spot stains indirectly.

Improve air quality with the LEVOIT Core 200S Air Purifier to reduce particles.

Complete Your Home Safety Setup

Enhance protection with these:

• Best Home & Kitchen Deals for bulk buys.
• Best Alternatives to Blink Outdoor 4 for cameras.
• Best Home Office Setups Under $1000 with safety in mind.

Frequently Asked Questions

How often should I test smoke and CO detectors?

Monthly push-button tests; replace batteries yearly (except sealed). Full units every 10 years.

What's the difference between photoelectric and ionization sensors?

Photoelectric excels at smoldering; ionization at flaming. Combos use both.

Do battery detectors work during power outages?

Yes, if battery-powered or with backup like our top Kidde pick.

Can I interconnect different brands?

Usually no—stick to same brand like Kidde for compatibility.

Are smart detectors worth it?

Yes, for app alerts and remote monitoring, like X-Sense.

Prioritize safety today—start with our top Kidde combo.