Do you need wifi in house for your Rachio to work?

Below are a couple of articles that may be of help. Which model of Rachio do you have?

https://support.rachio.com/hc/en-us/articles/115010380127-Rachio-Generation-2-FAQ#:~:text=What%20happens%20if%20I%20lose%20Wi-Fi%3F,point%20it%20will%20go%20offline.

https://support.rachio.com/hc/en-us/articles/115010378927-What-if-my-controller-goes-offline-