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What is the make and model of your thermostat? Many larger Class A coaches do have dual LP furnaces and usually there will be one on each side. IF you found one, look around the whole exterior for another port that matches this as they will always be the same make........either both Suburban or both Atwood Hydroflame furnaces. Attach a photo to your post of the thermostat(s) and that would help here. All follow ups are included in our fee.