In the winter, homes are buttoned up tight to keep warm, so you want to ensure that your supply vents are cleaned, you have installed a new air filter, and change the water panel in your humidifier. If you don’t have a humidifier, one should be added to keep the humidity in the home around 35%.
There are several great air purifiers available with various technologies that can properly kill the live cells passing through the furnace cabinet using UV light and cold plasma.
Some also add ionic technology that helps reduce airborne pathogens throughout the home as well. The two we install the most are the Reme-Halo and the iWave(R) systems. Both are also used in commercial clean-environment applications.