Adding a central humidifier to your forced warm air furnace. We like the April-Aire 600M unit. Installation is relatively straightforward. Here I show how we install them to keep our clients homes comfortable in the winter months when their warm air furnaces are running and drying out the house. These units help maintain comfortable humidification level through your home automatically. If you are interested and live in the Chelmsford Massachusetts area you can reach me at. DiBaccoPlumbing.com to set up a home visit consultation for a quote to add one for you.