Mine is mounted on outside,, but there is a remote sensor that I purchased $17 that allows complete unit to be mounted inside. My reason for the remote; My coop is in shade, and I have a dark tarp covering the area overhead. When I had a lighter (blue) tarp there before, the amount of...
Here is a good start. Read this persons' posts. He knows what he is talking about.
This is link to a post,,, but the whole thread is worth reading.
https://www.backyardchickens.com/threads/automatic-coop-door.1428493/post-23545254
I have a few more threads in mind,, that I responded to...
I have an Ador1 and it worked fine for me since 2017. I change a 6 volt lantern battery,, about once per year. The alkaline ones last somewhat longer.
I'm in somewhat less frigid area than you,,, so cant say what will be best for you..
The similar equivalent styles offered on amazon, are...