Gas Furnace Efficiency Calculator

This calculator will make an estimate of how long it will take to pay back your investment in a new natural gas furnace.

Gas furnace efficiency calculator.

For this comparison exercise we will assume a 65 afue furnace is getting replaced by a standard efficiency 80 or a high efficiency 95 furnace. With a less efficient furnace operating at 80 percent efficiency this would require a 60 000 to 72 000 btu furnace. House are the following. The only time you can rely on afue as a sole comparison is when comparing two furnaces with the same fuel type.

Thus efficiency alone is not an indicator of operating costs. You would be pretty disappointed if you replaced your natural gas furnace with an electric furnace hoping to save money in heating costs. With a high efficiency furnace operating at 95 percent the home only needs a. Using an online calculator and considering average gas prices in the us the results for a 1800 sq.

As quiet as they are efficient lennox furnaces also startup and run perfectly quietly helping to preserve the peace and quiet of your home. For example if a furnace has a listed input rating of 90 000 btu s and an efficiency rating of 80 it will produce 90 000 btu input x 80 efficiency 72 000 btu actual output. Furnace information estimated efficiency of present furnace.