Thus efficiency alone is not an indicator of operating costs.
Gas furnace efficiency calculator.
Lennox gas and oil furnaces are engineered to deliver perfect warmth efficiency and energy savings.
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.
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.
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.
Using an online calculator and considering average gas prices in the us the results for a 1800 sq.
Furnace information estimated efficiency of present furnace.
With a high efficiency furnace operating at 95 percent the home only needs a.
Delivering precise comfort and temperature control lennox furnaces can keep your home to within 0 5 degrees of your ideal temperature.
You would be pretty disappointed if you replaced your natural gas furnace with an electric furnace hoping to save money in heating costs.
This calculator will make an estimate of how long it will take to pay back your investment in a new natural gas furnace.