Air Leakage Cost Estimator   Fuel Type Cost per Unit Cost per Therm  
Cost per therm of heating fuel   Natural Gas -per CCF  
             
Cost per BTU of heating fuel   Oil - per gallon  
             
Estimated CFM50   Electricity - Per KWH  
             
Climate Factor   Propane - Per Gallon  
             
Estimated CFM Natural Air Leakage          
             
Estimated CFM of air leakage over 1 year          
             
Average Indoor Temperature          
             
Average Outdoor Temperature          
             
AFUE of Heating Appliance          
             
Average difference between inside and outside temperature          
             
Pounds of Air Leakage over 1 year          
             
BTU required to raise 1 year of air leakage 1 degree          
             
BTU required to raise 1 year of air leakage average temperature difference between inside and outside          
             
Total BTU adjusted for AFUE          
             
Estimated Cost of Air Leakage          
             
Retrofit Airsealing      
Man Hours on Site          
             
Hourly Costs          
             
Materials          
             
Total Cost of Retrofit          
             
CFM50 Reduction          
             
Yearly Savings          
             
Payback Period (Years)          
             
CFM per hour reduction needed          
             

Wisdom & Associates, Inc.
www.WisdomAndAssociates.com