My living room wall has 4 switches, 3 in a row below and a single switch above. The top switch turns the fireplace on and off, and the right-most of the 3 switches handles the lights. I'm assuming one of the other 2 switches is for a furnace fan that isn't installed, but I have no idea what the last switch is supposed to control. Is there anyway I could figure that out without hiring an electrician?
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