Here are the step-by-step setup instructions: Download the Sensi App: The Sensi thermostat is a Wi-Fi-enabled device. To install and configure it correctly, you must use the Sensi app. Download the Sensi app to your smartphone or tablet. It’s a free download. The Sensi app requires the following operating system (OS) software: Android (Google Play) version 4.0 or later. iOS (Apple) version 6.0 or later. Note that in the iOS store, the Sensi App will ONLY appear on an “iPhone only” search. On an iPad, you’ll need to change the search settings in the App Store. Create an Account: When you download the Sensi app, you’ll be prompted to create an account. This is required to log into your thermostat via Wi-Fi. Use a valid email address and a password of your choosing to create an account. Remember this email address and password; your Sensi thermostat will be linked to this email address once it’s registered. Gather Information: Before you begin installation, gather the following information: Sensi Security Card Router Name/SSID: Make sure this is a 2.4GHz network. Router Password Screwdriver Hardware in Sensi thermostat packaging Choose Installation Option: If no thermostats are registered yet, the Sensi app will prompt you to add a thermostat. You’ll see two options: “Install new thermostat on wall and connect to Wi-Fi”: Choose this if you haven’t had this thermostat professionally installed. “Connect already installed thermostat to Wi-Fi”: Choose this if a professional has already installed your thermostat, and you just need to connect it to your home Wi-Fi network. Installation Process: If you choose the first option, the Sensi app will walk you through the entire installation process, including identifying and connecting your wiring and connecting to Wi-Fi. Follow the step-by-step instructions provided by the app. Remember to turn off the power to your heating and air conditioning system before handling your thermostat wires. You’ll also need to photograph your existing wiring and remove the old thermostat cover.