I had 2 Bighorns and over at their forum someone came up with “the tent in the vent”. Basically the air comes straight down, hits the cover, and has to find its way to the side ducts. Fix is to make a piece of sheet metal into the shape of a V. Turn the V upside down like this ^. Furnace tape it to the ducts and fill any gaps so when the air come down it hits the^ and flows directly to the vents. I made my V with curves it for a better flow. Made air quieter and much stronger. Only had one AC in our Bighorns and it worked great. Air to the bedroom was very much improved. Only downside is all the sawdust you have to clean up that was blown out of the vents, LOL. Our Nu-Wa AC was installed much better and works great so I haven’t needed to do that mod.
