Hello Robert and thank you for the prompt answer. I looked around and found that there is a damper under the furnace (one way door allowing air to only come out of the furnace?), but I highly doubt that there is one in the ac supply line. However there are no crossover ducts anywhere. From what you ...

Hello everyone and thank you for a wonderful website, it has been tons of help already. Long story short, almost 3 years ago bought a Doublewide mobile home on a good property. The AC worked much better than the house we rented, but crawling under the house several times, I checked over the ductwork...