Clean Heating Ducts and Filters
Dust and dust mites thrive because of your heating system. Professional cleaners can give your ducts a clean bill of health. Change heat system filters at least once a month.
Wash Fido and Fluffy
When it's cold outside, pets need to come in. Their dander is a year round issue but is especially an issue when they need to be indoors. You just need to keep them in a confined living area. Keep carpets and furniture vacuumed and cleaned. Also, give them a bath every week if pet dander is a problem.