I have to A/Cs and have been on 30A before. What I recommend is that unless you need the bedroom on, to close the bedroom door and use the main unit until just before bedtime. About 30 minutes before, open the door turn the main unit to fan and turn the bedroom on. You should cool the bedroom down pretty quick. If you try to run the microwave while an A/C is running you will probably trip a breaker. The same will probably happen if you have both A/Cs running and cycle at the same time.
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