HVAC Load Calculation by State
Find state-specific HVAC design temperatures, IECC climate zones, energy codes, and sizing guidance. Each guide includes ASHRAE-based design temperatures for major cities and local building code requirements.
| State | Abbr | Climate Zone(s) | Design Temp (Winter/Summer) | Primary Load |
|---|---|---|---|---|
| California | CA | 2B, 3B, 3C, 4B, 4C, 5B | 30°F / 102°F | Cooling |
| Texas | TX | 2A, 2B, 3A, 3B | 20°F / 101°F | Cooling |
| Florida | FL | 1A, 2A | 25°F / 94°F | Cooling |
| New York | NY | 4A, 5A, 6A | -2°F / 85°F | Heating |
| Illinois | IL | 4A, 5A | -8°F / 91°F | Heating |
| Pennsylvania | PA | 4A, 5A | 0°F / 87°F | Heating |
| Ohio | OH | 5A | 0°F / 87°F | Heating |
| Georgia | GA | 3A, 4A | 20°F / 93°F | Cooling |
| North Carolina | NC | 3A, 4A | 18°F / 92°F | Cooling |
| Michigan | MI | 5A, 6A | -4°F / 83°F | Heating |
| Alaska | AK | 7, 8 | -47°F / 82°F | Heating |
| Alabama | AL | 2A, 3A | 19°F / 96°F | Cooling |
| Arizona | AZ | 2B, 3B, 4B | 28°F / 110°F | Cooling |
| Arkansas | AR | 2A, 3A | 13°F / 100°F | Cooling |
| Colorado | CO | 5B, 6B, 7 | -3°F / 95°F | Heating |
| Connecticut | CT | 5A | 3°F / 88°F | Heating |
| Delaware | DE | 4A | 12°F / 88°F | Heating |
| Hawaii | HI | 1A, 1B | 63°F / 88°F | Cooling |
| Idaho | ID | 5B, 6B | -11°F / 99°F | Heating |
| Indiana | IN | 4A, 5A | -4°F / 91°F | Heating |
| Iowa | IA | 5A, 6A | -9°F / 93°F | Heating |
| Kansas | KS | 4A, 4B, 5A | 3°F / 100°F | Heating |
| Kentucky | KY | 4A | 6°F / 95°F | Heating |
| Louisiana | LA | 1A, 2A | 22°F / 97°F | Cooling |
| Maine | ME | 6A, 7 | -8°F / 83°F | Heating |
| Maryland | MD | 3A, 4A | 9°F / 90°F | Heating |
| Massachusetts | MA | 5A, 6A | 3°F / 88°F | Heating |
| Minnesota | MN | 6A, 7 | -14°F / 89°F | Heating |
| Mississippi | MS | 2A, 3A | 21°F / 96°F | Cooling |
| Missouri | MO | 3A, 4A | 3°F / 98°F | Heating |
| Montana | MT | 6B, 7 | -19°F / 95°F | Heating |
| Nebraska | NE | 5A, 5B, 6A | -4°F / 95°F | Heating |
| Nevada | NV | 2B, 3B, 5B | 7°F / 113°F | Cooling |
| New Hampshire | NH | 6A, 7 | -6°F / 88°F | Heating |
| New Jersey | NJ | 4A, 5A | 11°F / 88°F | Heating |
| New Mexico | NM | 3B, 4B, 5B | 5°F / 96°F | Heating |
| North Dakota | ND | 6A, 7 | -23°F / 92°F | Heating |
| Oklahoma | OK | 3A, 3B, 4A | 9°F / 100°F | Cooling |
| Oregon | OR | 4C, 5B, 6B | 21°F / 102°F | Heating |
| Rhode Island | RI | 5A | 6°F / 86°F | Heating |
| South Carolina | SC | 1A, 2A, 3A | 18°F / 96°F | Cooling |
| South Dakota | SD | 6A, 7 | -14°F / 94°F | Heating |
| Tennessee | TN | 3A, 4A | 13°F / 96°F | Cooling |
| Utah | UT | 3B, 5B, 6B, 7 | 5°F / 97°F | Heating |
| Vermont | VT | 6A, 7 | -10°F / 86°F | Heating |
| Virginia | VA | 4A, 5A | 14°F / 93°F | Heating |
| Washington | WA | 4C, 5B, 6B | 17°F / 93°F | Heating |
| West Virginia | WV | 4A, 5A | 8°F / 89°F | Heating |
| Wisconsin | WI | 6A, 7 | -9°F / 88°F | Heating |
| Wyoming | WY | 6B, 7 | -13°F / 95°F | Heating |