Professional installation is not strictly required for Ecobee thermostats, as many users find that they can install the device themselves with relative ease. Ecobee provides detailed installation instructions and video guides that can help homeowners navigate the installation process on their own. However, some users may prefer to enlist the help of a professional installer, especially if they feel unsure about their electrical skills or if their heating and cooling system has a more complex setup. Ultimately, the choice between self-installation and professional help depends on the individual's comfort level with home improvement tasks. It may also be beneficial to consult the current information available on the Ecobee website for additional guidance and resources related to installation.