Calculating
Savings
Adding Insulation
When
you increase the insulation value of your attic or walls you will save
energy. How much depends on how many square feet, the initial insulation
level, the final insulation level and where your home is located. The
following formula is used.
Formula
AREA (sqft) x ( 1/Initial
Rvalue  1/Final Rvalue ) x 24 x HDDZ x Cost/Unit of Heating Fuel / Btu/Unit
of Heating Fuel / Heating System Efficiency = Annual Dollars Saved
Variables Defined
Area
= Length x Width of area to be insulated
Initial RValue & Final RValue = Figure out based on RValue
Table.
HDDZ = Heating Degree
Days. See HDDZ Table.
Heating Fuel Cost = Get from your bill by dividing units / cost.
Btu/Unit = Get from Fuel Btu Table.
Heating System Efficiency = Get from Heating
System Efficiency Table.
