https://archive.org/details/swgrap

From Frank Herbert’s Dune

Any road followed precisely to its end leads precisely nowhere. Climb the mountain just a little bit to test that it’s a mountain. From the top of the mountain, you cannot see the mountain.

It has done this since it was installed. I used what was in the box to mount and wire it. It requires a C wire which is available from the furnace. I traced the C wire back to the furnace control board and it’s connected to the C terminal block, but I am definitely not an expert on furnaces.