Architect and Engineering Manual

46
FORMULA FOR CALCULATING OPERATING COSTS USING ABOVE DATA:
(Cooling Hours based on 75°F indoor temperature with air conditioner sized to meet the design conditions.)
Heating* — Heat Loss KW x Heating Degree Days x “C” x Cost Per KWH = Operating Cost
Outdoor Design Temperature Difference
* The above formula is for electric resistance heating only. Power consumption using the Zoneline® heat pumps should be adjusted by Seasonal Performance Factor (SPF).
The local power supplier should be consulted for recommended value of “C.” This factor will vary between 17 and 24.
Cooling — Calculated Heat Gain (BTUH) x = Unit Cooling Watts x Cooling Hours x Cost per KWH = Operating Cost
Installed unit capacity (BTUH) 1,000 Watts/KW
LOCATION
ASHRAE
HEATING
DEGREE
DAYS
ESTIMATED
COOLING
Hours LOCATION
ASHRAE
HEATING
DEGREE
DAYS
ESTIMATED
COOLING
Hours LOCATION
ASHRAE
Heating
Degree
Days
Estimated
Cooling
Hours
ALABAMA KENTUCKY OHIO
Birmingham 2,551 1,390 Lexington 4,683 830 Cincinnati 5,265 840
Huntsville 3,070 1,340 Louisville 4,660 1,130 Cleveland 6,351 610
Mobile 1,560 1,640 LOUISIANA Columbus 5,660 810
Montgomery 2,291 1,580 Alexandria 1,921 1,670 Dayton 5,622 740
ARIZONA Baton Rouge 1,560 1,860 Toledo 6,494 590
Flagstaff 7,152 310 New Orleans 1,385 1,790 OKLAHOMA
Phoenix 1,765 2,280 Shreveport 2,184 1,470 Oklahoma City 3,725 1,200
Tucson 1,800 1,920 MAINE Tulsa 3,860 1,410
Yuma 974 2,520 Portland 7, 511 290 OREGON
ARKANSAS MARYLAND Medford 5,008 620
Fort Smith 3,292 1,410 Baltimore 4,654 850 Pendleton 5,127 590
Little Rock 3,219 1,330 MASSACHUSETTS Portland 4,635 270
CALIFORNIA Boston 5,634 500 PENNSYLVANIA
Bakersfield 2,122 1,530 MICHIGAN Harrisburg 5,251 730
Fresno 2,611 1,210 Detroit 6,293 590 Philadelphia 5,144 810
Los Angeles 2,061 310 Flint 7,377 440 Pittsburgh 5,987 590
Sacramento 2,502 1,030 Grand Rapids 6,894 530 Scranton 6,254 440
San Diego 1,458 390 MINNESOTA Williamsport 5,934 600
San Francisco 3,015 110 Duluth 10,000 200 RHODE ISLAND
COLORADO Minneapolis 8,382 550 Providence 5,954 470
Colorado Springs 6,423 520 MISSISSIPPI SOUTH CAROLINA
Denver 6,283 550 Jackson 2,239 1,560 Charleston 2,033 1,390
Grand Junction 5,641 910 MISSOURI Columbia 2,484 1,440
CONNECTICUT Columbia 5,046 960 Greenville 2,980 1,120
Hartford 6,235 480 Kansas City 4,711 1,210 SOUTH DAKOTA
DISTRICT OF COLUMBIA Springfield 4,900 970 Rapid City 7,3 45 580
Washington 4,224 1,010 St. Louis 4,900 1,080 Sioux Falls 7,839 610
DELAWARE MONTANA TENNESSEE
Wilmington 4,930 770 Billings 7,049 520 Chattanooga 3,254 1,180
FLORIDA Glasgow 8,996 410 Knoxville 3,494 1,070
Jacksonville 1,239 1,690 Great Falls 7,75 0 420 Memphis 3,232 1,320
Miami 214 2,850 Missoula 8,125 350 Nashville 3,578 1,220
Orlando 766 1,930 NEBRASKA TEXAS
Tallahassee 1,485 1,500 Grand Island 6,530 770 Corpus Christi 914 2,380
Tampa 683 2,350 Omaha 6,612 750 Dallas 2,363 1,900
GEORGIA NEVADA El Paso 2,700 1,580
Atlanta 2,961 1,130 Ely 7,733 500 Houston 1,396 1,850
Augusta 2,397 1,400 Las Vegas 2,709 1,980 Lubbock 3,578 1,310
Macon 2,136 1,440 Reno 6,332 520 San Antonio 1,546 1,920
Savannah 1,819 1,510 NEW JERSEY UTAH
IDAHO Newark 4,589 710 Milford 6,497 910
Boise 5,809 670 NEW MEXICO Salt Lake City 6,052 830
Lewiston 5,542 600 Albuquerque 4,348 1,040 VERMONT
Pocatello 7,033 570 Clayton 5,158 720 Burlington 8,269 130
ILLINOIS Silver City 3,705 1,260 VIRGINIA
Chicago 6,155 780 NEW YORK Norfolk 3,421 1,010
Moline 6,408 760 Albany 6,875 480 Richmond 3,865 1,020
Springfield 5,429 890 Binghamton 7, 286 310 Roanoke 4,150 870
INDIANA Bualo 7,062 450 WASHINGTON
Evansville 4,435 1,090 New York 4,811 790 Seattle 5,145 180
Fort Wayne 6,205 710 Rochester 6,748 470 Spokane 6,655 430
Indianapolis 5,699 820 Syracuse 6,756 500 Yakima 5,941 530
South Bend 6,439 600 NORTH CAROLINA WEST VIRGINIA
IOWA Asheville 4,042 690 Charleston 4,476 860
Burlington 6,114 730 Charlotte 3,191 1,230 Huntington 4,446 820
Des Moines 6,588 710 Raleigh 3,393 1,070 WISCONSIN
Sioux City 6,951 770 Winston-Salem 3,595 960 Madison 7,863 530
KANSAS NORTH DAKOTA Milwaukee 7,635 450
Dodge City 4,986 1,020 Bismarck 8,851 510 WYOMING
Goodland 6,141 800 Fargo 9,226 490 Casper 7,410 600
Topeka 5,182 880 Williston 9,243 580 Cheyenne 7, 381 420
Wichita 4,620 1,070 Sheridan 7,680 530
NORMAL YEARLY OPERATING DATA