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Cooktop: intermittent ignition, open burner Oven: electric glo-bar ignition, self cleaning Cooktop: 40.0% Oven: 5.8% Cooktop: pilot lights Oven: pilot light, not self-cleaning, standard door seals, standard vent rate, standard insulation Cooktop: 18.8% Oven: 3.5% Table 44. Default Electric Oven/Cooktop Characteristics Equipment Characteristics EF Cooktop: reflective pans, flat coil elements Oven: self-cleaning, improved door seals Cooktop: 77.7% Oven: 10.2% Cooktop: solid disc elements Oven: not self-cleaning, improved door seals, reduced vent rate, high density insulation Cooktop: 74.2% Oven: 12.1% Cooktop: nonreflective pans, rounded coil elements Oven: not self-cleaning, standard door seals, standard vent rate, standard insulation Cooktop: 73.7% Oven: 10.9%

Step 6. Technical and Economic Potential CalculationsTechnical potential was calculated as the aggregated annual savings in all homes in which the upgrade applies. Economic potential was calculated as the aggregated annual savings for upgrades in the subset of homes in which the upgrade passes a costeffectiveness threshold of net present value greater than zero (NPV>0) or simple payback period less than five years (SPP<5). This involves applying utility rates for electricity and other fuels to the modeled consumption.Step 7. Package SimulationsTo account for interactions between upgrades, packages of the most cost-effective upgrades in each home were simulated. For each building/location model, the upgrade with the highest NPV>0 in each category was chosen for inclusion in the package.The economic calculations from Step 6 were conducted for the package results as well. The analysis scope did not include packages designed to maximize simple payback period (SPP); however, SPP was calculated for the net present value (NPV)-optimized packages. Assumptions and LimitationsKey assumptions for this analysis are listed below.• Technical and economic potential are presented as annual energy savings rather than cumulative energy savings over a number of years.• Geographic scope is limited to the 48 contiguous U.S. states and Washington, D.C. Sources of housing characteristics and consumption data (particularly the Residential Energy Consumption Survey) for Alaska, Hawaii, and U.S. territories tend to have low sample sizes, resulting in high uncertainty in the data.Differences in assumptions or format of results may make comparisons to other efficiency potential analyses invalid.

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