Community Alumni
May 01, 2018The second AC location in most trailers I've seen is not ducted. If your trailer is built like this then all isn't lost. Sometimes just having a second AC running is enough to cool the dead spots though natural air movements. Works well on days when it's not searing hot. A helper fan works well on those really hot days as it helps to speed up the mixing of air.
If your second AC location isn't ducted, don't waste the time trying to tie it into the ductwork. If there's not a duct for a second AC then the ducts are probably sized to take the airflow from only one unit. If you were to add another unit to this system then the efficiency of each unit would go down as the two units compete against each other to occupy the limited amount of space. In the end, you don't really get to take advantage of the additional cooling capacity.