For the office building in the preceding table, compute the following for 2006:
a. Monthly natural gas consumption based on Btu/ft² of floor area.
b. Annual natural gas consumption based on Btu/ft² of floor area.
c. Monthly natural gas consumption normalized for weather conditions (degree-days), based on Btu/ft² · (°F · day).
d. Annual natural gas consumption normalized for weather conditions (degree-days), based on Btu/ft² · (°F · day).

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INFORMATION FOR DESIGN EXERCISES 4.34 AND 4.35. HISTORICAL ENERGY CONSUMPTION DATA FOR AN OFFICE BUILDING WITH 182 400 ft² OF FINISHED FLOOR AREA IS PROVIDED IN THE FOLLOWING TABLE. Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total Degree-Days (°F. days) 2006 2007 1007 1263 878 928 816 1030 494 570 111 189 22 30 0 2 0 0 112 414 669 709 610 661 316 83 52 48 47 62 420 225 569 626 906 987 621 5430 6079 4061 Consumption (MCF)a 91 2006 2007 1200 872 978 319 75 50 47 51 58 316 583 654 5203 Natural Gas 2006 Costs ($) $6 921.06 $5 956.04 $6 448.92 $3 087.82 $811.30 $507.52 $468.48 $458.72 $605.12 $2 194.78 $6 112.20 $6 064.62 $39 636.58 2007 $12 752.01 $9 264.05 $10 393.48 $3 394.96 $799.91 $531.50 $499.61 $542.13 $616.54 $3 360.41 $6 198.62 $6 953.35 $55 306.56 Electric Consumption (kWh) 2006 250 160 229 481 223 133 250 241 242 138 245 209 270 159 241 649 231 217 202 332 179 429 182 334 2 747 480 2007 Electricity 223 721 197 946 203 674 205 424 196 739 223 050 249 103 234 817 216 259 190 205 176 098 181 048 2 498 085 2006 Costs ($) $24 663.76 $22 853.97 $22 336.70 $25 145.54 $24 957.63 $25 369.99 $27 172.34 $25 030.63 $24 037.24 $21 576.98 $18 457.49 $18 710.29 $280 312.57 2007 $21 947.61 $19 886.37 $20 257.57 $20 831.28 $21 129.08 $23 654.68 $25 439.93 $21 592.35 $19 867.58 $17 867.22 $16 925.50 $16 476.64 $245 875.81