People are increasingly concerned about dirt and germs these pandemic days, but many are neglecting a spot where airborne contaminants can lurk: the air ducts. Even in the cleanest house, the indoor air system can recirculate contaminants. This can be a problem for children, seniors and those with respiratory or autoimmune conditions—and mean higher energy bills. Fortunately, a reputable, certified H-V-A-C professional can help. To find one, visit the National Air Duct Cleaners Association at n-a-d-c-a–dot–com.