Another vote here for the iris sensors. They were very easy to install, report temperature, and are frequently on sale. The WAF (wife approval factor) is not bad, because they are pretty small. One of the easiest things to connect to the hub and they come with really good 3m tape. They also have an ability to screw in the smaller part of the sensor. Just make sure you are getting the new ones and not the gen 1, as the old ones are not ST compatible.