FIGURE I Heating Load Hours (HLH) for the United States and Territories This map is reasonably accurate for most parts of the United States but is necessarily highly generalized FIGURE 3 Average Outdoor Air Temperature vs. Balance Point Temperature for 50 50 TOA (Reduced input 45 40 35 35 30 25 TOA BALANCE POINT TEMPERATURE TC (°F) This figure is based on 5200 degree-days and 5°F outdoor design temperature. FIGURE 4 Fraction of Total Annual Heating Load Applicable to Reduced Operating 1.0 0.0 FRACTION OF TOTAL ANNUAL HEATING LOAD APPLICABLE TO REDUCED OPERATING MODE (X1) BALANCE POINT TEMPERATURE TC (°F) This figure is based on 5200 degree-days and 5°F outdoor design temperature. [49 FR 12159, Mar. 28, 1984] FRACTION OF TOTAL ANNUAL HEATING LOAD APPLICABLE TO MAXIMUM OPERATING MODE OR MODULATING MODE (X2) |