Best Carbon Monoxide Detectors
Top carbon monoxide detectors ranked by transparent trust scores.
8 products ranked
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Top Pick
9.4
Excellent
Kidde Nighthawk
Ranked #1 based on expert reviews, user sentiment, and value analysis.
#1
9.4
Excellent
Consensus
Compare
Ranked #1 based on expert reviews, user sentiment, and value analysis.
Pros
- Digital display shows CO levels
- Battery backup for outages
- Peak level memory
Cons
- Plug-in requires outlet placement
- No smart home connectivity
Don't buy this if…
- The battery backup uses AA batteries that must be replaced annually; the detector will chirp incessantly when backup batteries are low.
#2
9.2
Excellent
Consensus
Compare
Ranked #2 based on expert reviews, user sentiment, and value analysis.
Pros
- Flexible plug-in or tabletop placement
- UL 2034 certified
- Digital CO level readout
Cons
- Battery backup requires replacement
- Basic design without smart features
Don't buy this if…
- Place the detector at knee height near sleeping areas, not in the kitchen or garage where combustion byproducts may cause false readings.
#3
9.0
Excellent
Consensus
Compare
Ranked #3 based on expert reviews, user sentiment, and value analysis.
Pros
- Voice alerts name danger type and location
- Phone notifications and remote silence
- Automatic self-testing
Cons
- Most expensive CO detector
- Requires Google Home ecosystem
Don't buy this if…
- The Nest Protect has a 10-year sealed battery lifespan; it cannot be battery-replaced and the entire unit must be discarded after 10 years.
#4
8.7
Excellent
Consensus
Compare
Ranked #4 based on expert reviews, user sentiment, and value analysis.
Pros
- 10-year sealed battery, no replacements
- Dual smoke and CO detection
- Large LCD display
Cons
- No smart home connectivity
- Must replace entire unit at end of life
Don't buy this if…
- The sealed 10-year battery means the entire unit must be replaced after its lifespan expires; mark the installation date for future replacement.
#5
8.5
Excellent
Consensus
Compare
Ranked #5 based on expert reviews, user sentiment, and value analysis.
Pros
- 10-year sealed battery
- Compact unobtrusive design
- No battery changes ever
Cons
- No digital display
- No smart features
Don't buy this if…
- Without a digital display, this detector only alerts at dangerous CO levels; it cannot show you low-level readings for early awareness.
#6
8.3
Good
Consensus
Compare
Ranked #6 based on expert reviews, user sentiment, and value analysis.
Pros
- 10-year sealed battery
- Digital CO and temperature display
- Flexible wall or shelf placement
Cons
- No interconnect capability
- No smart features
Don't buy this if…
- This standalone detector does not interconnect with other alarms; in a large home, consider interconnected models that trigger all units simultaneously.
#7
8.1
Good
Consensus
Compare
Ranked #7 based on expert reviews, user sentiment, and value analysis.
Pros
- Most accurate electrochemical sensor
- Event log records CO history
- 10-year sealed battery
Cons
- CO-only, no smoke detection
- Higher price for a basic detector
Don't buy this if…
- This is a CO-only detector and does not replace a smoke alarm; you still need separate smoke detection to meet building codes.
#8
7.9
Good
Consensus
Compare
Ranked #8 based on expert reviews, user sentiment, and value analysis.
Pros
- AudioLINK data extraction
- European quality engineering
- 10-year sealed battery
Cons
- Less common in US retail
- No Wi-Fi or smart home integration
Don't buy this if…
- Ei Electronics is a European brand; US availability may be limited to online retailers and local building code compatibility should be verified.
Quick Comparison
How We Rank
Composite trust score from expert reviews, user sentiment, complaint analysis, and value assessment.
Trust Score
Weighted composite of all factor scores
Expert Score
Aggregated expert review ratings
User Sentiment
Community votes and review analysis
Value Score
Price-to-performance ratio
Freshness
Recency of reviews and data
Change Log
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