The answer to 'how much to replace carbon monoxide detector in Chicago' is that the cost can vary widely depending on several factors. In general, you can expect to pay between $30 to $100 to replace a basic carbon monoxide detector in the Chicago area. The exact price will depend on the type of detector, the brand, and whether you hire a professional to install it.
Many hardware stores and home improvement retailers sell basic CO detectors for $30 to $50. More advanced models with additional features like digital displays or smart home integration can cost $75 to $100 or more. If you need to hire an electrician to handle the installation, you may pay an additional $50 to $100 or more for their labor and expertise.