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Formula for Calculating Operating Costs Using Above Data:
Normal Yearly Operating Data
(Cooling Hours based on 75°F indoor temperature with air conditioner sized to meet the design conditions.)
ASHRAE
Heating Estimated
Degree Cooling
Location Days Hours
ALABAMA
Birmingham 2,551 1,390
Huntsville 3,070 1,340
Mobile 1,560 1,640
Montgomery 2,291 1,580
ARIZONA
Flagstaff 7,152 310
Phoenix 1,765 2,280
Tucson 1,800 1,920
Yuma 974 2,520
ARKANSAS
Fort Smith 3,292 1,410
Little Rock 3,219 1,330
CALIFORNIA
Bakersfield 2,122 1,530
Fresno 2,611 1,210
Los Angeles 2,061 310
Sacramento 2,502 1,030
San Diego 1,458 390
San Francisco 3,015 110
COLORADO
Colorado Springs 6,423 520
Denver 6,283 550
Grand Junction 5,641 910
CONNECTICUT
Hartford 6,235 480
DISTRICT of COLUMBIA
Washington 4,224 1,010
DELAWARE
Wilmington 4,930 770
FLORIDA
Jacksonville 1,239 1,690
Miami 214 2,850
Orlando 766 1,930
Tallahassee 1,485 1,500
Tampa 683 2,350
GEORGIA
Atlanta 2,961 1,130
Augusta 2,397 1,400
Macon 2,136 1,440
Savannah 1,819 1,510
IDAHO
Boise 5,809 670
Lewiston 5,542 600
Pocatello 7,033 570
ILLINOIS
Chicago 6,155 780
Moline 6,408 760
Springfield 5,429 890
INDIANA
Evansville 4,435 1,090
Fort Wayne 6,205 710
Indianapolis 5,699 820
South Bend 6,439 600
IOWA
Burlington 6,114 730
Des Moines 6,588 710
Sioux City 6,951 770
KANSAS
Dodge City 4,986 1,020
Goodland 6,141 800
Topeka 5,182 880
Wichita 4,620 1,070
ASHRAE
Heating Estimated
Degree Cooling
Location Days Hours
ASHRAE
Heating Estimated
Degree Cooling
Location Days Hours
KENTUCKY
Lexington 4,683 830
Louisville 4,660 1,130
LOUISIANA
Alexandria 1,921 1,670
Baton Rouge 1,560 1,860
New Orleans 1,385 1,790
Shreveport 2,184 1,470
MAINE
Portland 7,511 290
MARYLAND
Baltimore 4,654 850
MASSACHUSETTS
Boston 5,634 500
MICHIGAN
Detroit 6,293 590
Flint 7,377 440
Grand Rapids 6,894 530
MINNESOTA
Duluth 10,000 200
Minneapolis 8,382 550
MISSISSIPPI
Jackson 2,239 1,560
MISSOURI
Columbia 5,046 960
Kansas City 4,711 1,210
Springfield 4,900 970
St. Louis 4,900 1,080
MONTANA
Billings 7,049 520
Glasgow 8,996 410
Great Falls 7,750 420
Missoula 8,125 350
NEBRASKA
Grand Island 6,530 770
Omaha 6,612 750
NEVADA
Ely 7,733 500
Las Vegas 2,709 1,980
Reno 6,332 520
NEW JERSEY
Newark 4,589 710
NEW MEXICO
Albuquerque 4,348 1,040
Clayton 5,158 720
Silver City 3,705 1,260
NEW YORK
Albany 6,875 480
Binghamton 7,286 310
Buffalo 7,062 450
New York 4,811 790
Rochester 6,748 470
Syracuse 6,756 500
NORTH CAROLINA
Asheville 4,042 690
Charlotte 3,191 1,230
Raleigh 3,393 1,070
Winston-Salem 3,595 960
NORTH DAKOTA
Bismarck 8,851 510
Fargo 9,226 490
Williston 9,243 580
OHIO
Cincinnati 5,265 840
Cleveland 6,351 610
Columbus 5,660 810
Dayton 5,622 740
Toledo 6,494 590
OKLAHOMA
Oklahoma City 3,725 1,200
Tulsa 3,860 1,410
OREGON
Medford 5,008 620
Pendleton 5,127 590
Portland 4,635 270
PENNSYLVANIA
Harrisburg 5,251 730
Philadelphia 5,144 810
Pittsburgh 5,987 590
Scranton 6,254 440
Williamsport 5,934 600
RHODE ISLAND
Providence 5,954 470
SOUTH CAROLINA
Charleston 2,033 1,390
Columbia 2,484 1,440
Greenville 2,980 1,120
SOUTH DAKOTA
Rapid City 7,345 580
Sioux Falls 7,839 610
TENNESSEE
Chattanooga 3,254 1,180
Knoxville 3,494 1,070
Memphis 3,232 1,320
Nashville 3,578 1,220
TEXAS
Corpus Christi 914 2,380
Dallas 2,363 1,900
El Paso 2,700 1,580
Houston 1,396 1,850
Lubbock 3,578 1,310
San Antonio 1,546 1,920
UTAH
Milford 6,497 910
Salt Lake City 6,052 830
VERMONT
Burlington 8,269 130
VIRGINIA
Norfolk 3,421 1,010
Richmond 3,865 1,020
Roanoke 4,150 870
WASHINGTON
Seattle 5,145 180
Spokane 6,655 430
Yakima 5,941 530
WEST VIRGINIA
Charleston 4,476 860
Huntington 4,446 820
WISCONSIN
Madison 7,863 530
Milwaukee 7,635 450
WYOMING
Casper 7,410 600
Cheyenne 7,381 420
Sheridan 7,680 530
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) 1000 Watts/KW