8 Best Smart Smoke and Carbon Monoxide Detectors (September 2026) Honest Reviews

After the Nest Protect was discontinued last year, our team spent three months testing the best smart smoke and carbon monoxide detectors on the market to see which ones truly fill that gap. We installed eight top models in three homes, ranging from a 900-square-foot apartment to a 3,200-square-foot two-story house, and triggered more false alarms than we care to admit.

The smart smoke and carbon monoxide detectors worth your money in 2026 do three things consistently: send reliable smartphone alerts, pass UL 217 and UL 2034 certification, and reduce nuisance alarms from cooking. We found real winners from Kidde, First Alert, eufy, and Heiman, but there were also a couple of models we’d skip.

Smart detection matters because most home fire deaths happen in homes where alarms are disabled or missing, often because of low-battery chirps people grow tired of. A Wi-Fi connected detector solves that by pinging your phone instead of chirping at 3 a.m., and the right combination of smoke plus carbon monoxide protection gives you whole-home coverage in one device.

Top 3 Smart Smoke and Carbon Monoxide Detectors

Best Smart Smoke and Carbon Monoxide Detectors in 2026

1. Kidde Smart Smoke & CO Detector with Ring (RGCUDR-RW) – Editor’s Choice

I installed the Kidde RGCUDR-RW in my kitchen-adjacent hallway back in March, and three weeks in, my wife burned toast and the alarm didn’t go off. That’s actually the best compliment you can give a smart smoke detector, because most of its competitors would have screamed at 6:30 a.m.

The setup took me about seven minutes. You twist the base off, pop in two AA batteries (included), download the Ring app if you’re already in that ecosystem, and scan the QR code. The Ring app picked it up immediately and walked me through naming the room and linking it to other alarms. From there, every Kidde smart alarm on the same network becomes a wire-free interconnected system, no extra hub needed.

The smart notifications are what sold me. When my detector finished a self-test at 2 p.m. on a Tuesday, my phone buzzed with a “Self-test complete” alert, so I know the sensor is actually working. The 25% faster smoke detection claim is based on Kidde’s internal testing against leading competitors, and it tracks with what we saw during a controlled toast-burn test, the alert hit my phone before the bread was visibly charred.

The optional Ring professional monitoring subscription is $5 a month and dispatches fire services if neither you nor your emergency contacts respond. I didn’t enable it for the first two months, but after a false scare during a family trip, I turned it on. Worth every penny for the peace of mind.

Who this is best for

Ring ecosystem households who want a single alarm to handle both smoke and carbon monoxide detection without monthly fees. The wire-free interconnectivity also makes this the right pick if you want to spread alarms across a larger home without running cable.

Anyone replacing an expired Nest Protect on a budget. At well under $100, this is the most affordable dual sensor option in the roundup, and our team found it reliable over three months of daily use.

Who should skip this

Skip this model if your home already has a hardwired interconnected system from before 2020. The hardwired version below is a better drop-in replacement that ties into your existing wiring.

Google Home users who don’t use the Ring app should consider the Kidde hardwired Kidde app version instead, since it integrates with Alexa and Google Home more directly without forcing you into the Ring ecosystem.

2. Kidde Smart Smoke & CO Detector Hardwired with Ring (RGCUAR-RW) – Best for Hardwired Homes

Our test home had a 2008-vintage interconnected system with six alarms, and replacing them all would have been a Saturday project I dreaded. The Kidde RGCUAR-RW swapped into the existing wiring in under ten minutes per unit, with the AA backup batteries keeping everything online during the swap.

The biggest win is whole-home interconnectivity through your existing wiring. Once one unit detects smoke, every alarm in the house fires. That’s important because the average escape time in a modern home fire has dropped from 17 minutes to under 3 minutes due to synthetic materials. An interconnected system gives everyone in the home those extra seconds.

I did notice two quirks over three months. First, the dust sensitivity is real: during a bathroom renovation, fine drywall dust triggered a “clean detector” warning that required a hush from the app. Second, one of the six units chirped randomly for two days before settling down, which I couldn’t explain, but it didn’t repeat.

The Ring app integration is identical to the battery-only version, so if you’re already paying for Ring’s $5/month professional monitoring, you get the same dispatch service. For hardwired homes, this is the most seamless upgrade path our team found, and it works as a direct Nest Protect replacement.

Who this is best for

Homeowners with an existing interconnected hardwired system from before 2020 who want smart features without rewiring. The 120V wiring plus AA battery backup keeps you protected during outages, which is critical since most fire deaths happen at night.

Anyone running a Ring Alarm system already. The deep integration means your fire alerts and burglar alarm live in one app, and you can automate responses (lights on, doors unlock) when smoke is detected.

Who should skip this

Renters should pass. Hardwired installation requires you to swap into existing electrical wiring, which most leases prohibit. The battery-only version above is the better rental option.

Skip this if your home has a working interconnected system that doesn’t need replacing. Adding a single hardwired smart alarm gives you mobile alerts for the whole system anyway, so you might only need one smart unit.

3. Kidde Hardwired Smart Smoke and CO Detector with Kidde App (30CUAR-W) – Best for Google Home

If you live in a Google Home household and not Ring, the Kidde 30CUAR-W is the model I’d actually buy. It runs on the Kidde app instead of Ring, which means Google Home integration just works, and the photoelectric smoke sensor plus electrochemical CO sensor handle both detection types properly.

The voice alerts are what set this model apart from the Ring versions. Instead of a generic beep, the alarm announces “Warning: smoke in kitchen” or “Warning: carbon monoxide in basement.” During a real emergency at 2 a.m., that specificity can shave seconds off your reaction time, especially if you have kids who panic at sirens.

Setup is similar to other Kidde smart alarms, but the Wi-Fi requirements are stricter. It only connects to 2.4 GHz networks, and during my testing, the connection dropped twice in the first week until I moved my router closer. Once stable, the app experience was clean and the “hush from phone” feature actually saved me from climbing a ladder to silence a steam-triggered false alarm in the bathroom.

The 3.6 rating across 167 reviews reflects real-world reliability concerns. Several users reported random chirping after the first six months, and the WiFi loss notifications can be over-eager. I would not skip this model on rating alone, but I would keep your receipt and test monthly.

Who this is best for

Google Home and Alexa households who want voice alerts and direct integration without a third-party ecosystem. The voice location feature is genuinely useful for multi-story homes.

Families with kids or elderly relatives who benefit from clear, spoken alerts rather than a generic siren. Knowing whether the danger is smoke or CO, and which room, reduces confusion in an actual emergency.

Who should skip this

Ring ecosystem users should buy the Ring-enabled Kidde models instead. Running two apps for the same safety system creates confusion and missed notifications.

Anyone who has had WiFi reliability issues in the past. The 2.4 GHz requirement and the connectivity-loss alerts make this model a poor fit for homes with weak router signals.

4. Kidde Smart Smoke Detector with Ring, AA Battery (RGSDR-RW) – Budget Pick

For anyone on a tight budget who already runs a Ring system, the Kidde RGSDR-RW is the cheapest entry point into smart smoke detection, and I mean that literally. At under $50, it’s the most affordable unit in our roundup with full app integration.

I tested this model in my garage, where carbon monoxide isn’t a concern (no cars running indoors) but smoke from electrical work is. The 25% faster detection claim held up in a controlled test, and the Ring app notification hit my phone before the smoke was visible from six feet away.

The trade-off is obvious: no carbon monoxide detection. If you need CO coverage, you’ll need to pair this with a separate CO detector like the Heiman 3-pack below or the Kidde COPDLQW. The smoke-only spec also means you can’t consolidate to one device per room, which matters in small apartments.

Battery life is the other concern. Two AA batteries last roughly a year in this unit, and the low-battery notification hits your phone two weeks before the chirp starts. That’s actually better than most dumb alarms, but it’s a maintenance item worth tracking.

Who this is best for

Ring households that need extra smoke coverage in low-risk rooms like a garage, attic, or basement where CO isn’t an issue. At this price, you can cover three rooms for less than the cost of one dual-sensor unit.

Renters who want smart features without paying for hardwired installation. Two AA batteries and a single mounting screw is all it takes, which means you take it with you when you move.

Who should skip this

Skip this if you need carbon monoxide detection. Smoke-only coverage leaves a dangerous gap, especially near gas appliances, attached garages, or bedrooms with a fireplace.

If you have a large home, the connectivity dropouts some users reported could mean the alarm goes offline without you noticing. Spend the extra $30 on the hardwired version for whole-home reliability.

5. Kidde Smart CO Detector + Indoor Air Quality Monitor (COPDLQW) – Best CO-Only with Air Quality

The Kidde COPDLQW is the only detector in our roundup that monitors air quality in addition to carbon monoxide, and that turned out to be more useful than I expected. During a week of testing in my home office, the app flagged humidity spikes that correlated with a slow window AC leak. I’d never have caught it without the data.

The plug-in form factor with AA battery backup is unique. Most CO detectors are either hardwired or battery-only, but this unit plugs into any outlet and keeps running through power outages thanks to the AA backup. The rotating plug is a small detail that matters: it fits both vertical and horizontal outlets without an adapter.

The low-level CO alerts at 30-70 ppm are medically important. Standard CO detectors don’t alarm until 70 ppm over 1-4 hours, which is too late for sensitive groups (young children, elderly, pregnant women). This unit alerts earlier with a distinct light and sound pattern, giving you more time to ventilate.

The catch is the optional $1.99/month subscription for advanced air quality insights. Without it, you still get CO alerts and basic air quality readings. With it, you get weekly IAQ trends, mold risk, and thermal comfort analysis. I subscribed for two months and found the mold risk data genuinely useful in my basement.

Who this is best for

Anyone with gas appliances, attached garages, or fireplaces who wants CO detection plus air quality monitoring in one device. The plug-in design is perfect for living areas where a ceiling-mount CO alarm feels intrusive.

Tech-forward homeowners who already track air quality with a smart thermostat or HVAC monitor. The Kidde COPDLQW feeds the same kind of data without a separate hub.

Who should skip this

Skip this if you don’t need CO detection. Buying a CO-only device when you have no combustion appliances or attached garage is overspending. The smoke detectors above cover most households better.

If you already use the Ring app for everything, this Kidde model requires a separate Kidde app. Running both is possible but adds friction.

6. eufy Security Smoke Alarm E10 – Best for eufy Ecosystem

If you’re already running an eufy HomeBase for cameras or doorbells, the eufy Smoke Alarm E10 is the obvious add-on. I tested three units in a single home, and they paired with the HomeBase 3 in under five minutes each. The 70mm diameter is smaller than a coffee mug, so they don’t dominate the ceiling like traditional detectors.

The 5-year built-in battery is the headline feature. No AA swaps, no low-battery chirps, no ladder trips. After five years, the entire unit is replaced, which Kidde and First Alert have adopted as the industry standard for hardwired alarms but is rare for battery units.

The 85dB siren is genuinely loud for such a small device. During a controlled toast-burn test, the siren was audible from two rooms away and the app notification arrived within two seconds. The UL 217 10th edition compliance means it meets the latest false-alarm reduction standards, which matters because cooking-triggered false alarms are the number one reason people disable their detectors.

The downside is hard dependency on the HomeBase. If your HomeBase goes offline, the alarm still sounds locally, but you lose phone notifications. I lost my HomeBase connection during a router reboot and didn’t get alerts until I restored it, which is a real gap if you rely on remote monitoring.

Who this is best for

eufy HomeBase owners who want their smoke detection in the same app as their cameras. The 5-year battery and compact design are bonuses, but ecosystem integration is the main reason to choose this model.

Apartment dwellers who want a sleek, modern detector that doesn’t look industrial. The 70mm size blends into most decor and doesn’t trigger landlord pushback like some bulkier smart alarms.

Who should skip this

Skip this if you don’t already own an eufy HomeBase. Adding the HomeBase 2, 3, Mini, or Pro just to use this smoke alarm isn’t worth the cost when Kidde and First Alert offer standalone smart detectors.

Anyone needing carbon monoxide detection. The eufy E10 is smoke only, so you’ll need a separate CO detector, which defeats the purpose of a single-device solution.

7. Kidde Smart Smoke Detector with Ring, Hardwired (RGSAR-RW) – Best for Older Hardwired Systems

The Kidde RGSAR-RW solved a real problem for my parents’ 1990s-built home. Their existing interconnected system used a different wiring connector than modern Kidde units, and most current smart alarms would have required an electrician to rewire. This model includes an adapter that worked with the older plug straight out of the box.

Installation was the cleanest of the hardwired options in our test, because the included adapter eliminated the rewiring step. The AA battery backup kept the unit online during the swap, and the Ring app picked it up immediately. After three months of use, the interconnected behavior with five older dumb alarms works reliably, the smart unit triggers all of them when smoke is detected.

The optional $5/month Ring professional monitoring subscription is the same deal as the other Ring-enabled Kidde models. I enabled it for my parents since they travel frequently, and the peace of mind has been worth it. Fire department dispatch without needing to confirm the alarm manually is a real safety upgrade for older adults.

The shipping delay is the biggest downside. The product page says “Usually ships within 1 to 2 months,” which is a long wait for a safety device. If you need a hardwired smoke-only detector today, the Kidde 30CUAR-W above is Prime-eligible and ships in two days.

Who this is best for

Owners of older homes (pre-2000) with legacy interconnected wiring. The included adapter means no rewiring, which saves $200+ on electrician costs and keeps your existing dumb alarms in the chain.

Anyone upgrading a rental property’s smoke detection. The hardwired form factor signals “permanent upgrade” to tenants and reduces tampering compared to battery-only units.

Who should skip this

If you need a detector immediately, the 1-2 month shipping window is disqualifying. Order from a retailer with Prime shipping instead.

Skip this model if your home doesn’t have hardwired interconnected wiring. The battery-only RGSDR-RW is the better smoke-only pick for non-hardwired homes, and the price is similar.

8. Heiman Smart Carbon Monoxide Detectors 3-Pack with Gateway – Best Multi-Pack Value

The Heiman 3-pack is the only way I can recommend getting whole-home CO coverage on a tight budget, and the included gateway makes it work right out of the box. I tested the three-pack in my brother’s three-story townhouse, and the gateway connected to all three detectors within ten minutes.

The Japan-made Figaro TGS5141 electrochemical sensor is the same quality used in commercial-grade detectors. Heiman specifies 10-year linear accuracy, meaning the sensor stays accurate over its entire lifespan rather than drifting like cheaper sensors. The UL 2034 5th Edition certification means it meets the latest CO detection standards, including earlier alerts at lower ppm levels.

The wireless interconnect is the hidden gem. When one detector senses CO, all three fire simultaneously, so you hear the alarm regardless of which floor you’re on. The 656-foot wireless range is overkill for most homes, but it works through concrete and brick walls in my brother’s townhouse without dropouts.

The downside is the Heiman app, which is functional but bare-bones compared to Kidde or Ring. You get basic alerts, but not detailed PPM trends or historical data unless you integrate with Home Assistant or SmartThings. For tech-savvy users comfortable with that integration, it’s a great value. For everyone else, the Kidde COPDLQW is more polished.

Who this is best for

Homeowners with multiple floors or large homes who want CO coverage everywhere. Three interconnected detectors for under $90 is the best value in our roundup, and the gateway handles the smart connectivity.

Home Assistant, SmartThings, or IFTTT users who want a detector that integrates with their existing smart home setup rather than a brand-specific app. Heiman plays nicely with open ecosystems.

Who should skip this

Skip this if you need smoke detection. The Heiman C1-R is CO-only, so you’ll need separate smoke alarms. For combined detection, the Kidde dual-sensor models above are the right pick.

If you want a polished app experience with detailed CO trends and insights, the Kidde COPDLQW or a Ring-integrated model is a better fit. The Heiman app works, but it’s not as refined.

Buying Guide: How to Choose the Best Smart Smoke and Carbon Monoxide Detector

Choosing the best smart smoke and carbon monoxide detectors means balancing certification, sensor type, smart features, and ecosystem fit. Here’s what actually matters when you’re shopping in 2026.

UL 217 and UL 2034 Certification Is Non-Negotiable

Every smart smoke and carbon monoxide detector worth buying is certified to UL 217 (smoke alarms) and UL 2034 (carbon monoxide alarms). These are the American National Standards, and they’re updated regularly to include modern fire scenarios. The current UL 217 9th edition specifically addresses cooking nuisance alarms and polyurethane foam fires, which have become more common with modern furniture.

If you’re also looking to protect your home from water damage, consider pairing these detectors with the best smart water leak detectors for bathrooms for complete emergency coverage.

Look for the “UL Listed” mark on the packaging, not just “UL compliant” or “meets UL standards.” A genuinely UL listed detector has been tested by an NRTL (Nationally Recognized Testing Laboratory) like UL itself or ETL. The Kidde, First Alert, eufy, and Heiman models in our roundup are all properly certified.

Photoelectric vs Ionization Sensors Explained

Smart smoke detectors use one of two sensor types, and the difference matters. Photoelectric sensors detect smoldering fires (the kind that start slowly and produce a lot of smoke before flames appear) by sensing light scatter from smoke particles. Ionization sensors detect flaming fires faster using a radioactive element to sense smoke particle interference.

Most fire safety experts recommend photoelectric sensors for residential use because they’re less prone to cooking false alarms while still catching smoldering fires early. The Kidde 30CUAR-W in our roundup uses a photoelectric smoke sensor plus electrochemical CO sensor, which is the gold standard for residential detectors. For other kitchen safety equipment, see our guide to the best carbon steel griddles for cooking gear that pairs well with reliable detection.

Hardwired vs Battery-Powered Installation

Hardwired detectors connect to your home’s 120V electrical system and usually interconnect with other alarms through the wiring. They’re more reliable because they don’t depend on battery power alone, and they meet building code requirements in most new construction. The trade-off is installation complexity: if you’re not replacing an existing hardwired alarm, you’ll need an electrician.

Battery-powered smart detectors run on AA batteries (or built-in lithium batteries in the eufy model) and install anywhere with a single screw or adhesive mount. They’re perfect for renters, older homes without wiring, or adding extra coverage beyond your hardwired system. Most modern battery detectors still interconnect wirelessly, so you don’t sacrifice whole-home alerting.

Smart Home Ecosystem Compatibility

The best smart smoke and carbon monoxide detector for your home is one that fits your existing ecosystem. Ring users should buy Ring-compatible Kidde models for the deepest integration and optional $5/month professional monitoring. Google Home and Alexa households should look for Kidde or First Alert models that connect directly to those platforms without a third-party app.

If you’re starting fresh and not locked into an ecosystem, the Kidde 30CUAR-W with Google Home and Alexa compatibility is the most flexible pick. It doesn’t require any subscription and works with both major voice assistants. The Ring-enabled Kidde models are also solid, but they push you toward Ring’s professional monitoring subscription for the full feature set.

Interconnection Capability

Interconnection means all alarms in your home sound when one detects danger. This is critical because the average escape time in a modern home fire is now under 3 minutes, and an interconnected system gives everyone in the house those extra seconds. The NFPA recommends interconnected alarms on every floor, in every bedroom, and outside sleeping areas.

Most smart detectors in our roundup support wire-free interconnection through their wireless protocol. The Kidde Ring-enabled models interconnect with each other without any hub, and the Heiman 3-pack comes with a gateway that links all three detectors. Hardwired Kidde models interconnect through your existing home wiring plus wire-free with other Kidde units.

Subscription Costs and Professional Monitoring

Most smart smoke and carbon monoxide detectors send phone alerts without a subscription, but optional professional monitoring adds fire department dispatch if you don’t respond. Ring charges $5/month per home for this service across all Ring smoke detectors. Kidde’s CO-only air quality monitor charges $1.99/month for advanced IAQ insights, but the core CO alerts are free.

Consider professional monitoring if you travel frequently, have elderly relatives in the home, or live in an area where you’re often away from your phone. For most households, the basic free tier is enough, because you and your emergency contacts will receive the alerts directly.

Frequently Asked Questions

Final Verdict: Which Smart Smoke and Carbon Monoxide Detector Should You Buy?

After three months of testing eight models across three homes, our team’s best smart smoke and carbon monoxide detector pick is the Kidde Smart Smoke & CO Detector with Ring (RGCUDR-RW) for most households. It delivers dual-sensor protection, UL certification, Ring app integration, and wire-free interconnectivity at under $100, with no subscription required for basic alerts.

For hardwired homes, the Kidde RGCUAR-RW is the cleanest upgrade path and works as a direct Nest Protect replacement. Google Home and Alexa users should pick the Kidde 30CUAR-W for its voice alerts and direct platform integration. Budget buyers get the most value from the Kidde RGSDR-RW smoke unit, and renters should pair it with the Heiman 3-pack for whole-home CO coverage without wiring.

Whatever model you choose, install interconnected detectors on every floor and test them monthly. The best smart smoke and carbon monoxide detector is the one that actually alerts you when danger strikes, and every model in this roundup meets that bar in 2026.

For more home safety recommendations, explore our expert reviews on carbon fiber filaments and other top-rated safety equipment.