Table 2.
Regional energy savings for existing single-family homes increasing insulation from current practice to IECC 2000 levels.
| Northeast (NE/MA) | Midwest (ENC/WNC) | South (SA/ESC/WSC) | West (MTN/PA) | Total | |
| All-electric homes | |||||
| # households (millions) | 1.0 | 1.6 | 11 | 3.8 | 17 |
| Source savings (TBTU/year, % of national total) | 15 (5%) | 31 (11%) | 190 (69%) | 41 (15%) | 280 |
| Per-capita savings (MMBTU/household/year) | 15 | 20 | 17 | 11 | 16 |
| Non-electric heated homes | |||||
| # households (millions) | 6.5 | 9.9 | 7.5 | 5.3 | 29 |
| Source savings, fossil fuel (TBTU/year, % of national total) | 130 (26%) | 220 (46%) | 97 (20%) | 43 (9%) | 490 |
| Source savings, electricity (TBTU/year, % of national total) | 0.43 (2%) | 1.6 (6%) | 25 (89%) | 0.98 (3%) | 28 |
| Source savings, total (TBTU/year, % of national total) | 130 (24%) | 230 (44%) | 120 (24%) | 44 (8%) | 520 |
| Per-capita savings(MMBTU/household/year) | 19 | 23 | 16 | 8.3 | 18 |
Note: Estimates are presented to two significant figures; sums may not add due to rounding. Percentages represent the fraction of benefits within each region.