So… I’m at the part of the thermostat installation where it says “Go to your furnace and open your system’s cover”. I have a cooling/heating unit that is on my roof. I cannot climb up on my two-story house to have access to my cooling/heating unit. Is that what the instructions want me to access? That large unit on my roof? If so, I guess I’m returning my thermostat.
I’ve installed programable thermostats before, but I’ve never had to do anything to the furnace, just installation at the wall.
Please help me understand.