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Then to calculate the output on a given gas furnace multiply it s efficiency rating by it s listed input rating to determine the actual btu output of heat.

Gas furnace efficiency calculator. With a high efficiency furnace operating at 95 percent the home only needs a. You would be pretty disappointed if you replaced your natural gas furnace with an electric furnace hoping to save money in heating costs. 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.

Furnace information estimated efficiency of present furnace. The only time you can rely on afue as a sole comparison is when comparing two furnaces with the same fuel type. Delivering precise comfort and temperature control lennox furnaces can keep your home to within 0 5 degrees of your ideal temperature. Lennox gas and oil furnaces are engineered to deliver perfect warmth efficiency and energy savings.

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. Thus efficiency alone is not an indicator of operating costs. House are the following.

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