What should I know about furnace efficiency

The main advantage of an 80% furnace over a 90% furnace is typically the initial cost. 80% furnaces tend to be less expensive to purchase and install than their higher efficiency counterparts, such as 90% or 95% furnaces. This is because 80% furnaces have a simpler design and require less expensive materials to manufacture.

Another advantage of 80% furnaces is that they may be better suited for homes in certain climates, such as the Southeast, where heating demands are typically lower than in colder regions. In these areas, a high-efficiency furnace may not be necessary to meet heating needs and may not result in significant energy savings. Additionally, the milder weather in the Southeast means that furnaces are typically used less frequently, so the potential cost savings from a high-efficiency furnace may be minimal.