What does it cost to install a duct-mounted carbon monoxide detector near a Toronto home furnace?

A duct-mounted carbon monoxide detector for a Toronto home furnace typically costs $150-$400 installed, though this requires an ESA-Licensed Electrical Contractor since it involves electrical connections to the HVAC system.

Duct-mounted CO detectors are specialized devices that monitor carbon monoxide levels in the air circulating through your home's ductwork. Unlike wall-mounted residential CO detectors, these units are installed directly in the supply or return air plenum near your furnace and can automatically shut down the HVAC system if dangerous CO levels are detected. This is particularly important in Toronto's older housing stock where furnaces, water heaters, and fireplaces share mechanical rooms and combustion air supplies.

The detector itself costs $80-$200 depending on the brand and features. Basic models simply sound an alarm, while more advanced units can interface with your furnace controls to automatically shut down the system and activate exhaust fans. Popular brands include Honeywell, System Sensor, and Macurco. Professional installation adds $70-$200 and must be performed by an ESA-Licensed Electrical Contractor since the device requires 120V power and integration with your HVAC system's control wiring.

Installation complexity varies significantly based on your furnace location and electrical setup. If your furnace room already has adequate electrical outlets and the duct plenum is easily accessible, installation is straightforward. However, many Toronto basement furnace rooms have limited electrical infrastructure, requiring new circuits or junction boxes. Older homes with galvanized steel ductwork may need sheet metal modifications to properly mount the detector housing.

Ontario Building Code and TSSA requirements don't specifically mandate duct-mounted CO detectors for residential installations, but they're strongly recommended if you have multiple gas appliances or a furnace room with poor ventilation. Standard residential CO detectors are required by Ontario law within 5 metres of sleeping areas, but duct-mounted units provide an additional layer of protection by monitoring the air your HVAC system distributes throughout the home.

Consider the broader context of your home's combustion safety. If you're installing a duct-mounted CO detector due to concerns about your furnace or other gas appliances, have a TSSA-registered contractor inspect your entire combustion system. Common CO sources in GTA homes include cracked heat exchangers, blocked chimney flues, backdrafting water heaters, and inadequate combustion air supply. A duct-mounted detector is excellent protection, but addressing the root cause of potential CO production is equally important.

Timing and maintenance matter for effectiveness. Install the detector during your furnace's annual service when a qualified technician can properly integrate it with your system controls. Test the unit monthly and replace the sensor every 5-7 years as recommended by the manufacturer. Remember that duct-mounted CO detectors complement but don't replace wall-mounted residential CO detectors required throughout your home.

Need help finding an ESA-Licensed Electrical Contractor for this installation? Toronto Ductwork can match you with qualified professionals through the Toronto Construction Network who understand both electrical requirements and HVAC system integration.