Where are you parked
Is your bedroom in the afternoon sun
The bedroom a/c might have to run continually to stay cool
Is the lr cool
Maybe it does not Need to run continually to stay cool
Are both units 9000btu
It is the font a/C larger , and does not need to run full time compressor to maintain temp setting
I can explain it to you.
But I Can Not understand it for you !
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1997 F53 Bounder 36s