Quote:
Originally Posted by The Gritz Carlton
^^^what he said^^^ The 14"x14" hole is standard for the roof vents and the a/c dimensions. If it's a ducted ceiling make sure you purchase a "ducted" unit so you can tie it into that airflow and get the benefit up front also. I'm not sure how the duct system works when there is only one air in it as you have from the factory. Lots of folks here have done this and will come to your aid soon.
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To answer your question, at least in our MH:
The ducts are not cut into that bedroom opening.
We installed a non-ducted unit in the bedroom - works just like a standard non-ducted A/C unit.
It had no effect on the front A/C running air to the ducts in the bedroom.
Half the cooling air in the bedroom A/C shoots straight down the hall to the front of the MH if the bedroom door is open, plus, return to the front A/C from the ducts in the bedroom entrains cooler bedroom air to the front of the MH.
Running both A/Cs will cool down the MH to the 72 degree setting in about an hour, even with the cab curtains open, with outside temps in the upper 90s. Once there, the front A/C can maintain it. But before, with just the front A/C running, you'd be lucky to break 80 inside in the heat of the day with all the temp conservation items in place.