The nice thing about the thermostat is that Home Depot sells them.
All you have to do is connect the wires up, most of the time it doesn't matter where you put them.
Now they are digital so you don't have to level them. That is good as I have seen them sideways and yes upside down. The guy spent a great deal of time drilling a cinder block wall, inserting plastic anchors and then found out the sub base was installed upside down, he said it works upside down so why change it. I agreed and left it that way so my partner could get a good laugh too.