Ecovent is installed one room at a time but is a whole home solution. The Ecovent mobile app will walk you through the step-by-step guide to your installation.
In general, the installation flow is as below:
Download Ecovent Mobile App (iOS, Android) and create a user account
Connect your Hub to the Internet
Connect your thermostat(s)
Add your rooms (repeat for all rooms)
Add a Sensor
Add your Vent(s)
Click below link for step-by-step installation flow.