Winter is supposed to be a cozy time of year—hot cocoa, warm blankets, and the comfort of home. But if you’ve noticed household members dealing with excessive sneezing, itchy eyes, or a scratchy throat while inside, your furnace and air ducts could be contributing to these issues. Many homeowners don’t realize that the very systems keeping them warm can also affect their indoor air quality in Framingham, contributing to wintertime allergies, colds, and discomfort.