HVAC: What's best for cold climates?

So....
I had some work to do that required me to have my door open for an hour, or so. I turned the head unit off but it continued to put out heat. Is that normal?
 
2 heads
1 upstairs and 1 downstairs

You probably switched it from heat to automatic mode which keeps a range. See earlier “Grand kids “ post lol.

In your defense those Lcd icons get smaller every year.

Probably not a bad EEV which allows refrigerant to bleed over to second zone when one zone is running.
 
Am I the only one that hates the aesthetics of mini splits? I'm assuming you can use existing duct work but it will be less efficient?
 
You are not the only one. I want ducts.
 
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