You probably know that the furnace in your house won’t last forever. Any type of machine that does as much work as a furnace during Vermont and New York winters will wear down to the point where it needs to be replaced.
To get the best return on investment in your furnace, you want it to last as long as possible—although not so long that it becomes a huge energy waster, develops safety problems, or become unreliable. Knowing how many years you can expect from your furnace will help you anticipate when to replace it.
This is a question people often ask about furnace performance. During the winter, the moisture level in the air drops as more water vapor becomes pulled out of the air as snow. Dry conditions may be helpful during the summer, when it makes it easier for the human body to cool down in the heat. Bu dry air during the rest of the year presents comfort and health problems. Furnaces are often blamed from causing the air to become even drier. Is there any truth to the idea that a furnace “dries out” a home’s air? 
