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.