A typical residential heating system utilizing natural gas to generate warmth, circulating it via a network of ducts and vents, can be categorized by its efficiency. Older models, often referred to as standard, convert a specific percentage of the fuel’s energy into usable heat. The Annual Fuel Utilization Efficiency (AFUE) rating quantifies this conversion. For instance, a unit with an AFUE of 80% transforms 80% of the gas into heat, while the remaining 20% is lost, typically through the flue.
Such heating systems were once commonplace, providing a cost-effective solution for many homeowners. Their robust design and relatively simple mechanics made them reliable and easy to maintain. However, with increasing energy costs and a growing awareness of environmental impact, these systems are being superseded by more efficient alternatives. While the initial purchase price might be lower compared to high-efficiency models, the long-term operational expenses can be higher due to increased fuel consumption.
