To use the map and chart, first determine the SEER of your current system. Then using the map, find your zone. Cross-reference your zone and SEER in the table to determine your approximate operating cost. Take the difference between your current cost and that of a new, more efficient system to learn your estimated annual savings.

Cooling/Heating Efficiencies	Approximate Annual Cooling Operating Costs
SEER/HSPF	Zone 1	Zone 2	Zone 3	Zone 4	Zone 5
6/6.0	$2,036	$1,888	$1,954	$1,945	$1,965
8/6.5	$1,796	$1,637	$1,660	$1,646	$1,578
10/7.5	$1,533	$1,388	$1,461	$1,445	$1,300
12/8.0	$1,407	$1,262	$1,258	$1,243	$1,134
13/9.7	$1,324	$1,187	$1,181	$1,166	$1,059
14/9.7	$1,243	$1,112	$1,104	$1,091	$986
15/9.6	$1,189	$1,057	$1,040	$1,025	$902
18/10	$1,139	$1,005	$980	$929	$816
(Based on 2005 DOE national average price for electricity [0.0945/kwh]. Assuming the use of 36,000 BTU nominal capacity. Information derived using Elite Energy Audit Program. Cooling based on Bin data. Operating cost based on 2,100 sq. ft. and occupancy of 4 people. Actual savings may vary.) Seasonal Energy Efficiency Ratio (SEER) is a measure of air-cooling efficiency. The government’s minimum rating for new air conditioning systems is 13 SEER. Heating Season Performance Factor (HSPF) is a measure of air-heating efficiency. A higher HSPF rating indicates a more energy efficient unit.