The answer to 'how much to replace carbon monoxide detector' is that the cost can vary widely depending on the type of detector, your location, and whether you hire a professional or do it yourself. Typically, you can expect to pay anywhere from $20 to $100 for a basic replacement carbon monoxide detector. However, more advanced models with additional features like digital displays or smart home integration can cost $150 or more.
The labor cost to have an electrician or HVAC technician install the new detector can add $50 to $200 or more, depending on your location and the complexity of the installation. It's generally recommended to have a professional handle the installation to ensure it's done properly and safely.