The answer to 'how much is carbon monoxide detector upgrade' is that the cost can vary widely depending on several factors. In general, upgrading or installing a new carbon monoxide (CO) detector in your home can range anywhere from $20 to $150 or more per unit, depending on the type of detector, the features it offers, and whether professional installation is required.
The main factors that influence the cost of a CO detector upgrade include the technology (basic vs. smart/connected models), the number of detectors needed for your home's size, and whether you hire an electrician for the installation. Basic plug-in or battery-operated CO detectors are typically the most affordable, while smart detectors with Wi-Fi connectivity and mobile app integration tend to be more expensive. Additionally, hardwired detectors that require electrical work will usually cost more than plug-and-play models.