Where should CO detectors be placed?

On every level, within 15 feet of bedrooms, and near fuel-burning appliances. Mount on wall at 5 feet or on ceiling.

How long do CO detectors last?

The sensor lasts 5-7 years. Replace the entire unit when it expires - do not just replace batteries.

Carbon Monoxide DetectorGenerating image…

Safety & PPE

Fire Safety

Budget: $15-$25 (basic battery or plug-in) | Mid-range: $30-$50 (digital display) | Premium: $80-$150 (smart combo smoke/CO)

Carbon Monoxide Detectors: CO Alarm Protection for Your Home (2026)

Prepared by Lumberama's Building Materials Team

|Last updated May 25, 2026|Sources & methodology

Carbon monoxide detectors monitor for dangerous levels of odorless, colorless CO gas produced by fuel-burning appliances, vehicles, and generators. They alert occupants before CO reaches harmful concentrations. Required by code in most states for homes with fuel-burning appliances or attached garages.

Key Features

Electrochemical CO sensing technology; Digital display shows CO levels; Battery
plug-in
and hardwired options; 85+ dB alarm at dangerous levels; 5-7 year sensor lifespan

Specifications

Sensor: electrochemical | Display: digital PPM readout | Power: battery

plug-in 120V

hardwired | Alarm levels: 70 PPM (1-4 hrs)

150 PPM (10-50 min)

400 PPM (4-15 min) | Certification: UL 2034

Applications

Near bedrooms in homes with gas appliances; Each level of the home; Near attached garages; In RVs and boats with fuel appliances; Near fireplaces and wood stoves

Installation Overview

Mount on wall 5 feet above floor or on ceiling. Place within 15 feet of bedrooms. For plug-in models, insert into outlet at knee height. Test monthly. Replace per manufacturer lifespan (5-7 years for sensor).

Pros & Cons

Pros

✓ Detects invisible odorless gas; Digital displays show real-time levels; Plug-in models are simple to install; Can save lives from silent killer

Cons

✗ Sensors expire after 5-7 years; Can false alarm from certain chemicals; Battery models need monitoring; Must be replaced more often than smoke detectors

Top Brands

Kidde

First Alert

Google Nest Protect

Code Requirements

Required in most states per IRC R315 in homes with fuel-burning appliances or attached garages. Must be installed outside sleeping areas and on every level. Hardwired interconnected required in new construction.

Buying Tips

Consider combination smoke/CO detectors to reduce the number of devices; Digital display models let you monitor CO levels even below alarm thresholds; Replace CO detectors per the expiration date printed on the unit