Unusual: First you will need to check whether the duct system has been contaminated (rodent droppings, molds etc). If so, you need to get the duct work cleaned . If your HVAC system had not worked before, the restarting of the HVAC may stir up the settled dust in the house and thus causing your allergic symptoms. If this problem persists for more than 2 weeks, check with installer.
Answered 12/15/2014
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