To change the email that your s40 is registered to, you need to go to the thermostat and follow these steps: from the main screen, select menu > user account > email. here you can change your account information such as name, phone number, and email address. please note that you can also make these changes from your mobile app by tapping/clicking on your email address on the top right and then selecting view account.
For more information or a visual representation of steps please reference our user guide here
