DIY mold test kit?

Whenever it is winter I tend to get scratchy throat prone to getting sinus infection just sitting at home. Since I live in a rainy winter area, I wonder if there is mold growing somewhere and leaking into the hvac.
I see DIY mold test kit online. I believe they are dishes filled with agar gel. Can these kit really tell the difference between toxic mold versus not so toxic ones (e.g. mold that grows on bread)?
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