Calculating
Savings
Reducing Air Infiltration
When
you tighten your home, you reduce the air changes per hour (ACPH) of the home
and consequently you reduce the amount of energy required to heat all that
incoming air. The
following formula is used to determine annual energy saving from reducing your
ACPH:
Formula
Volume (cuft) x ( ACPH
current  ACPH proposed ) x 0.018 x 24 x HDDZ x Cost/Unit of Heating Fuel / Btu/Unit
of Heating Fuel / Heating System Efficiency = Annual Dollars Saved
Variables Described
Volume
= Length x Width x Height of House
ACPH = Air Changes per Hour. See Air
Infiltration 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.
