First of all, moisture in the air is very important. Many people get sinus infections during the winter months being cooped up in the house. I prefer the Vick's Vaporizer in my bedroom and I try to keep it boiling @ night. Servicing your heater filters regularly is important too, filters should be changed @ month. At the first sign of a sinus infection I snort a sea salt, baking soda, distilled water solution up my nose 2x's a day, That really helps. 1cup distilled water 1tsp. sea salt, 1/4 tsp soda, slightly heat in microwave, put in a baby bulb and snort it up your nose. I know it sounds gross and it is but it WORKS!