My system had similar issues. One pretty easy modification was to get a replacement vent for the bathroom that allows me to close it off. The original vent was just directing airflow straight out. Now I keep it shut all the time because that vent was likely the closest to the furnace and all the heat went in there. This helped a lot by not wasting so much hot air into the bathroom.
I also figured out that even though I have two air conditioners they are cross ducted so really work best when both are running. And the one has a furnace but the other does not. The one without the furnace doesn’t have a “heat” mode it still seems to generate heat when using auto which is likely accomplished by running the compressor in reverse like apartment hvac systems without a furnace do.
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2018 Voltage 3305
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