ANSWERS: 1
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Sounds to me as if you may have a mold problem. Temperature changes can stir up mold spurs and cause allergy like symptoms. It does not have to be in your central heat and air unit to become airborne. Mold doesn't always show up in open places as mold breeds better in dark damp places. You can have your home tested which is pretty reasonable. getting rid of the mold on the other hand is dangerous and expensive but can also harm you if not taken care of.
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