Compare Furnace Efficiencies

Annual Natural Gas Savings Calculation

 
Enter Seasonal Efficiency of the Proposed System   %     For Example: Changing from a standard to high-efficiency gas furnace at 95% efficiency if present annual fuel cost for space heating is $1000.

( ( 95 - 60 ) / 95 ) * 1000 = $368

Therefore, $368 in savings per year could be realized by installing a high-efficiency gas furnace, and a chimney would not be required.
  %  
Enter Seasonal Efficiency of the Existing System   %       %  
Enter Present Annual Fuel Cost for Space Heating $     $  
             
Potential Yearly Savings from Furnace Upgrade $     $  
                 
 
To perform a manual calculation, use this formula:
  A - B    
Annual $ Savings =  ---------- x C
  A    
 
     
Where  A = Seasonal efficiency of the proposed system
B = Seasonal efficiency of the existing system
C = Present annual fuel cost for space heating
 
     
  For Example: Changing from a standard to high-efficiency gas furnace at 95% efficiency if present annual fuel cost for space heating is $1000.

((95 - 60)/95) x 1000 = $368 savings per year

Therefore, $368 in savings per year could be realized by installing a high-efficiency gas furnace, and a chimney would not be required.