How much accuracy do you need? For temperature sensors this is expressed as a plus/minus.
For example, a sensor with a plus/minus of 2° might be inaccurate by that much. So it might report the temperature is 70° when it was actually 68° or 72° or anywhere in between.
A different sensor with an accuracy of plus/minus 1° might be inaccurate by that much. So it might report a temperature as 70° when it was actually 69° or 71° or anywhere in between.
And one of the more expensive sensors has a plus/minus of 0.2°. So it might report the temperature as 70° when it was actually 69.8 or 70.2 or anywhere in between.
For your purposes I would think a plus/minus of 2° should be fine. But obviously that’s up to you.
I’m going to retitle this thread so hopefully you’ll get more people responding.
Do you already have a SmartThings Hub For this location? And if so, which model? Otherwise were you intending to use Wi-Fi sensors, because there aren’t very many of those available.
Finally, before we go too much further… Is there someone available near the house who can go over if there are any issues. Smart things does have fairly frequent outages, historically typically at least one a month for the last 20 months. The outages may last only a few minutes or if you happen to be one of the unlucky few runs into a problem it could be a day or more.
In particular, it is quite common that after a Hub firmware update, which typically comes about once a month but sometimes more often, that some of your sensors might have to be physically reset, that is the case opened, the battery removed, and then replaced. So you might need to have someone go over and do that.
You can see a discussion of issues some people are having after the most recent update in the following thread. Again, this is an everybody every time, but it is an issue to be aware of in planning.
And here’s a discussion on planning for outages: