Your HVAC system circulates all the air in your home, and the damp, dark conditions inside it breed mold and bacteria that can make you sick. Have a professional inspect it if you're getting ill.
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The crazy thing about heating and air is that all the air in your home at some point comes through that system. So if your system is making you sick, you could have some growth going on. You need to get it checked out by a professional because the unit's in a damp, dark, cold environment. And what happens when you have that? You have growth. Things start happening, things you don't want to happen. So get a professional to come out and take a look at your system and see what's happening. Have you ever had stuff growing on your vent? You weren't sure what it was? Leave your story in the comment below.