when to replace furnace

When Should You Start Thinking About Purchasing a New Furnace? Think about a new furnace before it fails, the way you replace tires before a blowout. Most units deliver 15 to 20 years of service. As yours nears that window, watch for rising energy bills, uneven rooms, repeated repairs, or safety issues. We recommend planning 6 to 12 months before heating season and roughly 1 to 2 years before expe ...