Are you thinking of replacing your old furnace? Searching for the right one might be quite a tedious and confusing task, especially if you're a first time buyer. Read our tips on where to start. Repair or Replace New furnaces greatly increase energy efficiency, but that's not the only reason why you should buy a new one. If your furnace is more than 15-20 years old, has a pilot light, lacks vent dampers or a draft fan, or has been converted from coal to gas/oil, it may be tim