As homeowners, we often take our heating systems for granted, expecting them to work flawlessly whenever we turn them on. However, like any mechanical system, furnaces wear down over time, leading to inefficiencies or complete failure. Recognizing the early warning signs can help you avoid sudden breakdowns, costly repairs, and chilly nights. Here are six key indicators that your furnace may be on the verge of failing, so you can act before it’s too late.