When the weather turns cold and you start up your furnace for the first time in the year, you may notice a burning smell in the air as the machine wakes up.
This burning smell is the result of settled dust and dirt burning off inside the parts on your system. Apart from a potential fire hazard, that kind of dust buildup is an indicator of how much your system can stray from peak performance while it sits dormant and unused in the summer.
A furnace tune-up once a year will help your system to run at maximum efficiency. Just as importantly, a system that is well-maintained over the course of its lifetime will last longer before needing to be replaced.