Help installing thermostat... Furnace is on roof!

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.

Thanks, Debbie

Yes, a return would be the best option in your situation. Sorry.

Thank you… I have scheduled a return.