What Does AFUE Mean?
December 12, 2018
While an air conditioner’s efficiency is measured by its SEER (Seasonal Energy Efficiency Ratio) rating, an electric or gas- or oil-fired furnace’s efficiency is measured by its AFUE, or Average Fuel Utilization Efficiency. This standard measurement is given in percentages, letting you know how much of your fuel is actually used to heat your home and much fuel is wasted. The higher the AFUE rating, the more efficient the unit is. Typically the ratings or percentages you’ll see on new furnaces range from 80 to 100 percent (contingent upon the fuel type of furnace being rated). If a furnace has an AFUE of 80 percent, this means the furnace converts 80 percent of the fuel to heat your house, while the remaining 20 percent is lost, usually out the chimney.
How to Use AFUE When Purchasing a New FurnaceKeep in mind that AFUE is only the efficiency of that furnace to convert fuel into heat. The higher the number, the better it is at that conversion. So, yes, that will save in energy costs. But the higher-efficiency furnaces also cost more than their lower-efficiency comrades. That’s something you need to be mindful of when new-furnace shopping. You need to weigh these factors against one another, as well as the cost of your type of furnace fuel, when looking to make that decision. Our technicians at Comfort Zone Heating & Cooling here in Ontario, OR, are experts at factoring all these components into the best recommendations for a new furnace for you. Call us any time for an appointment. In general, the type of fuel your furnace uses is more important in determining the optimal furnace for your home than the AFUE is. Fuels such as gas, propane, and electric vary greatly in cost and need to be one of the first decisions you make when it comes to purchasing a new furnace. Once you’ve decided which fuel you’ll be using (you may opt to change your fuel source from your present one when upgrading), then compare the AFUE ratings on furnaces with that fuel source. Don’t compare an electric furnace’s AFUE to a gas furnace’s rating. They’re totally different. And as mentioned above, if you’re doing a cost analysis on your upcoming furnace purchase, be sure to factor the fuel costs into your analysis. Even though an electric furnace may have an AFUE rating of 100 percent, the cost of electricity is higher than gas. So while the gas-furnace’s AFUE rating of 96 percent indicates it’s more costly in its efficiency than the electric furnace, it’s actually be cheaper for you to go with the gas furnace due to the high cost of electricity.
Questions to Ask When Furnace Shopping
- What are my long-term goals for my home?
- What type of furnace fuel will I use?