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The best carbon monoxide detector for home depends on the room: a plug-in near the bedroom, a combo in the hallway and a gas-and-CO alarm near fuel appliances.
We compared 7 alarms and matched each to the room where it works best.
Quick Answer: The Best Carbon Monoxide Detector for Home
- Best for Bedrooms: Kidde Carbon Monoxide Detector, Plug-in with AA Battery Backup, 85 dB Alarm, 3rd Edition
- Best for Hallways: Kidde Smoke & Carbon Monoxide Detector, 10-Year Battery, 30CUD10
- Best Near Gas Appliances: Kidde Carbon Monoxide + Explosive Gas Alarm, Plug-in with 9V Battery Backup, Digital Display
- Best for Basements: Kidde Carbon Monoxide Detector, 10-Year Battery, Digital Display, 3rd Edition
- Best for Living Areas: First Alert Plug in Carbon Monoxide Alarm with Digital Display CO615
- Best Whole-Home Set: X-Sense Wireless Combination Smoke and CO Detector, XP0H-WN, 3-Pack
- Best Wired Homes: First Alert Hardwire Combination Smoke & Carbon Monoxide Alarm SMICO100-AC
The Kidde Plug-In CO Detector (AA Backup) is our best carbon monoxide detector for home bedrooms. The Kidde 30CUD10 Smoke & CO Detector suits hallways, and the Kidde CO + Explosive Gas Alarm suits rooms with gas appliances.
Best Carbon Monoxide Detector for Home Comparison Table
| Product | Best For | Type | Key Feature | Buy |
|---|---|---|---|---|
| Kidde Carbon Monoxide Detector, Plug-in with AA Battery Backup, 85 dB Alarm, 3rd Edition | Best for Bedrooms | Plug-in CO alarm | 120V plug-in, 2-AA backup, peak level memory | Check Price |
| Kidde Smoke & Carbon Monoxide Detector, 10-Year Battery, 30CUD10 | Best for Hallways | Smoke and CO combo | 10-year battery, UL 217 and UL 2034 | Check Price |
| Kidde Carbon Monoxide + Explosive Gas Alarm, Plug-in with 9V Battery Backup, Digital Display | Best Near Gas Appliances | Plug-in CO and gas alarm | Detects CO plus natural gas and propane | Check Price |
| Kidde Carbon Monoxide Detector, 10-Year Battery, Digital Display, 3rd Edition | Best for Basements | Battery CO alarm, digital | Sealed 10-year lithium battery, display updates every 15 s | Check Price |
| First Alert Plug in Carbon Monoxide Alarm with Digital Display CO615 | Best for Living Areas | Plug-in CO alarm, digital | Digital display, peak level, battery backup | Check Price |
| X-Sense Wireless Combination Smoke and CO Detector, XP0H-WN, 3-Pack | Best Whole-Home Set | Interconnected smoke and CO | Wireless interconnect, 10-year batteries | Check Price |
| First Alert Hardwire Combination Smoke & Carbon Monoxide Alarm SMICO100-AC | Best Wired Homes | Hardwired smoke and CO | Hardwired, battery backup, interconnect | Check Price |
The 7 Best Carbon Monoxide Detectors for Home
Each pick below was compared on sensor type, power source, alerts, certification and value.
Kidde Carbon Monoxide Detector, Plug-in with AA Battery Backup, 85 dB Alarm, 3rd Edition
1The Kidde plug-in CO detector runs from a standard 120V outlet with two AA batteries as backup during outages.
👍 Pros & Cons
Pros
- Plug-in with 2-AA battery backup
- Peak Level Memory
- Test-Hush button
Cons
- No digital readout
📄 Detailed Review
- Type: Plug-in CO alarm
- Includes: Alarm + 2 AA batteries
- Key feature: 120V plug-in, 2-AA backup, peak level memory
It sounds an 85 dB alarm, and Peak Level Memory records the last time CO was detected or the unit was tested.
It is the simplest dependable CO alarm for most homes.
Kidde Smoke & Carbon Monoxide Detector, 10-Year Battery, 30CUD10
2The Kidde 30CUD10 detects both smoke and carbon monoxide and runs on a built-in 10-year battery.
👍 Pros & Cons
Pros
- Smoke and CO in one
- 10-year battery
- Helps reduce cooking false alarms (maker claim)
Cons
- Replace the whole unit at end of life
📄 Detailed Review
- Type: Smoke and CO combo
- Includes: Alarm
- Key feature: 10-year battery, UL 217 and UL 2034
Kidde says it is tested to UL 217 and UL 2034 and helps reduce cooking false alarms.
It is our pick for a combo alarm.
Kidde Carbon Monoxide + Explosive Gas Alarm, Plug-in with 9V Battery Backup, Digital Display
3This Kidde alarm detects carbon monoxide plus explosive gases such as natural gas and propane.
👍 Pros & Cons
Pros
- Detects CO and explosive gas
- Digital display shows CO or GAS
- 9V backup
Cons
- Placement rules differ for gas
📄 Detailed Review
- Type: Plug-in CO and gas alarm
- Includes: Alarm + 9V battery
- Key feature: Detects CO plus natural gas and propane
Its display shows the CO level or reads GAS when explosive gas is present.
It suits homes with gas appliances.
Kidde Carbon Monoxide Detector, 10-Year Battery, Digital Display, 3rd Edition
4Kidde’s 10-year CO detector runs on a sealed lithium battery, so you never change batteries.
👍 Pros & Cons
Pros
- 10-year battery, no battery swaps
- Digital display
- Wall or tabletop
Cons
- Whole unit is replaced at end of life
📄 Detailed Review
- Type: Battery CO alarm, digital
- Includes: Alarm
- Key feature: Sealed 10-year lithium battery, display updates every 15 s
Its digital display updates every 15 seconds, and three LEDs show normal, alarm and replace status.
It is our pick for no-hassle protection.
Check Kidde 10-Year Battery CO Detector, Digital Price on Amazon
First Alert Plug in Carbon Monoxide Alarm with Digital Display CO615
5The First Alert CO615 adds a digital display and a peak level feature that shows the highest CO concentration measured.
👍 Pros & Cons
Pros
- Digital display
- Peak level shows highest CO measured
- 7-year limited warranty
Cons
- Takes an outlet
📄 Detailed Review
- Type: Plug-in CO alarm, digital
- Includes: Alarm + backup battery
- Key feature: Digital display, peak level, battery backup
It plugs into an outlet with battery backup and sounds an 85 dB alarm.
It is our pick for a digital readout.
X-Sense Wireless Combination Smoke and CO Detector, XP0H-WN, 3-Pack
6The X-Sense XP0H-WN 3-pack interconnects wirelessly, so when one alarm detects smoke or CO, all of them sound.
👍 Pros & Cons
Pros
- All alarms sound together
- 10-year sealed batteries
- No wiring needed
Cons
- No Wi-Fi app
📄 Detailed Review
- Type: Interconnected smoke and CO
- Includes: 3 alarms
- Key feature: Wireless interconnect, 10-year batteries
Each alarm runs on a sealed 10-year battery.
It is our pick for whole-home coverage without wiring.
First Alert Hardwire Combination Smoke & Carbon Monoxide Alarm SMICO100-AC
7The First Alert SMICO100-AC is a hardwired smoke and CO alarm with battery backup.
👍 Pros & Cons
Pros
- Interconnects with compatible alarms
- Quick Connect plug
- Battery backup
Cons
- Needs existing wiring
📄 Detailed Review
- Type: Hardwired smoke and CO
- Includes: Alarm
- Key feature: Hardwired, battery backup, interconnect
When one alarm sounds, all compatible interconnected alarms sound too.
It is the pick for replacing wired alarms.
Check First Alert SMICO100-AC Hardwired Smoke & CO Price on Amazon
How We Chose the Best Carbon Monoxide Detector for Home
To choose the best carbon monoxide detector for home, we compared popular CO alarms and smoke-and-CO combos on Amazon by power source, display, alerts, listed standards and owner feedback.
CDC advises installing battery-operated or battery back-up CO detectors near every sleeping area; see the CDC carbon monoxide poisoning basics.
Product details in this guide are based on manufacturer specifications and verified owner feedback. Read more on our How We Test page.
Buying Guide: CO Alarms Room by Room
Keep these points in mind before you buy.
Where to install CO alarms
CDC advises a detector near every sleeping area. Many makers also suggest one on every level; follow the manual on distance from fuel-burning appliances.
Common CO sources
Furnaces, water heaters, gas stoves, fireplaces, generators and running cars in attached garages can all produce CO. CDC advises yearly service of fuel-burning appliances.
CO-only or smoke and CO combo
Combo alarms save ceiling space and batteries; separate alarms let you place CO detectors lower or plug them into outlets.
Home Safety Tips
Protect every room:
- One near each sleeping area.
- One on each level.
- Service appliances yearly.
- Check the chimney yearly.
Quick answers about the best carbon monoxide detector for home.
Frequently Asked Questions
What is the best carbon monoxide detector for home?
The best carbon monoxide detector for home is the Kidde plug-in for bedrooms, the Kidde 30CUD10 for hallways and Kidde’s gas-and-CO alarm near fuel appliances.
Where do CO alarms go in a house?
Near every sleeping area per CDC; many makers also suggest every level.
Should I put one in the kitchen?
Follow the manual on distance from cooking and fuel appliances.
Does a fireplace need a CO alarm nearby?
Have the chimney checked yearly and keep alarms in nearby rooms.
Do basements need CO alarms?
If they have a furnace or water heater, many choose one there.
Final Verdict
Our final pick for the best carbon monoxide detector for home is the Kidde Plug-In CO Detector (AA Backup). Choose the Kidde 30CUD10 Smoke & CO Detector if you want hallways, or the Kidde CO + Explosive Gas Alarm for rooms with gas appliances.
Related Guides
More home safety guides:
- Best Carbon Monoxide Detector
- Best Carbon Monoxide Detector for Beginners
- Best Carbon Monoxide Detector for Everyday Use
- Best Carbon Monoxide Detector for Families
- Best Emergency Power Supply for Home
Product details are based on manufacturer specifications at the time of writing. Prices and availability change often, so check Amazon for the latest price.
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