A second furnace or heater is probably just a heat strip. It will be inside of the air conditioner unit underneath the cover. You'll have to pull the cover off and look and see. It will be towards the front and have fins. On mine it plugged in on the side. If you do a YouTube search you will probably find some additional information on it. It is not connected to the main furnace in any way.
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Chip Bruce, RPh
Kansas City, MO
2016 Impact 312
2017 Silverado 3500HD SRW
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