It is dry this winter and the asthma is acting up in both me and my daughter. I needed to get a couple of air humidifiers. One for her bedroom and one for mine. My husband and son do not have the allergy and asthma problems my daughter and I share. Proper humidity in the winter makes all the difference in being comfortable and symptom free. A further benefit of a proper humidity level is that moister air retains heat better. You can turn down the thermostat because the moisture in the air is a great heat sink. It absorbs the heat and then releases it when needed. You will have no idea of how well this works unless you do an experiment. Use a hygrometer to measure humidity levels in your home on a cold day. See how you feel when it is dry. On the same type of day with the same temperature outside, see how you feel when the humidity level is made higher in your home by a good humidifier.