Modern furnaces are significantly more energy-efficient compared to older models. Newer furnaces can have an Annual Fuel Utilization Efficiency (AFUE) rating of 90% to 98%, meaning they convert 90-98% of the fuel they use into heat. In contrast, older models may have AFUE ratings as low as 60-70%, wasting a substantial portion of energy. Upgrading to a modern, high-efficiency furnace can help lower energy bills, reduce your home’s carbon footprint, and provide more consistent heating. Additionally, modern systems often come with features like variable-speed blowers for increased comfort and efficiency.