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quick question

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Being a carpenter I don't know much about HVAC. My question is.. is the outside unit supposed to be running while the inside unit is? Heating not cooling.
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depends on whether the outdoor unit is a heat pump or straight ac.
It's a heat pump
Then, the answer is yes. Periodically, you will hear a whoosh noise, that can sound overwhelming. This noise is normal, as it is going into a defrost cycle that lasts a few minutes. The purpose of the defrost cycle is to melt any ice build-up that collects on the outdoor coil.
Thanks. That's the answer I was looking for.
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