Kansas climate zones and HVAC design temperatures
Kansas spans 2 IECC climate zones. 98% of people live in zone 4A (mixed, humid). In Wichita, heating and cooling equipment is sized for 97°F in summer and 13°F in winter.
Design temperatures for major cities
| City | Zone | Summer 1% | Winter 99% | Water in |
|---|---|---|---|---|
| Wichita | 4A | 97°F | 13°F | 61°F |
| Overland Park | 4A | 91°F | 9°F | 58°F |
| Kansas City | 4A | 93°F | 10°F | 60°F |
| Topeka | 4A | 94°F | 9°F | 59°F |
| Dodge City | 4A | 97°F | 9°F | 58°F |
Summer: exceeded in 1% of hours. Winter: colder in only 1% of hours. Water in: estimated groundwater temperature for tankless water heater sizing. Computed for each county from NOAA hourly weather data, 2015-2024; see where our numbers come from. Hottest summer design in the state: 99°F (Greeley County); coldest winter design: 4°F (Brown County).
Typical equipment sizes in Wichita
One-story house with average insulation (R-13 walls, R-30 attic, double-pane windows), at Wichita's design temperatures. Your house can need more or less; use the calculators for yours.
| House | Central AC | Gas furnace (95% AFUE) | Heat pump |
|---|---|---|---|
| 1,500 sq ft | 2.5 tons | 40,000 BTU | 2.5 tons + 5 kW backup |
| 2,000 sq ft | 3 tons | 40,000 BTU | 3.5 tons + 5 kW backup |
| 2,500 sq ft | 3.5 tons | 60,000 BTU | 4 tons + 5 kW backup |
AC size calculator Furnace size calculator Heat pump size calculator
Climate zone by county
From the 2021 International Energy Conservation Code (IECC), as published by the U.S. Department of Energy. The zone sets the insulation and window requirements in the energy code; the number runs from 1 (hottest) to 8 (coldest), and the letter is A for moist, B for dry and C for marine.
Zone 4A: mixed, humid (88 counties, 98% of people)
| County | Summer 1% | Winter 99% |
|---|---|---|
| Allen County | 95°F | 14°F |
| Anderson County | 95°F | 14°F |
| Atchison County | 92°F | 6°F |
| Barber County | 98°F | 13°F |
| Barton County | 97°F | 9°F |
| Bourbon County | 93°F | 14°F |
| Brown County | 92°F | 4°F |
| Butler County | 95°F | 12°F |
| Chase County | 94°F | 10°F |
| Chautauqua County | 94°F | 14°F |
| Cherokee County | 94°F | 14°F |
| Clark County | 97°F | 9°F |
| Clay County | 96°F | 8°F |
| Cloud County | 95°F | 7°F |
| Coffey County | 94°F | 10°F |
| Comanche County | 98°F | 13°F |
| Cowley County | 96°F | 14°F |
| Crawford County | 93°F | 14°F |
| Dickinson County | 96°F | 9°F |
| Doniphan County | 92°F | 6°F |
| Douglas County | 94°F | 8°F |
| Edwards County | 97°F | 9°F |
| Elk County | 94°F | 14°F |
| Ellis County | 97°F | 7°F |
| Ellsworth County | 97°F | 7°F |
| Finney County | 96°F | 8°F |
| Ford County | 97°F | 9°F |
| Franklin County | 93°F | 8°F |
| Geary County | 96°F | 9°F |
| Graham County | 98°F | 6°F |
| Grant County | 96°F | 8°F |
| Gray County | 96°F | 8°F |
| Greenwood County | 94°F | 10°F |
| Hamilton County | 99°F | 7°F |
| Harper County | 98°F | 13°F |
| Harvey County | 95°F | 10°F |
| Haskell County | 96°F | 8°F |
| Hodgeman County | 97°F | 9°F |
| Jackson County | 94°F | 9°F |
| Jefferson County | 94°F | 9°F |
| Johnson County | 91°F | 9°F |
| Kearny County | 96°F | 8°F |
| Kingman County | 98°F | 13°F |
| Kiowa County | 97°F | 11°F |
| Labette County | 95°F | 14°F |
| Lane County | 96°F | 8°F |
| Leavenworth County | 91°F | 8°F |
| Lincoln County | 98°F | 10°F |
| Linn County | 93°F | 8°F |
| Lyon County | 94°F | 10°F |
| Marion County | 95°F | 10°F |
| Marshall County | 93°F | 4°F |
| McPherson County | 97°F | 11°F |
| Meade County | 98°F | 12°F |
| Miami County | 93°F | 8°F |
| Mitchell County | 95°F | 7°F |
| Montgomery County | 94°F | 14°F |
| Morris County | 96°F | 9°F |
| Morton County | 99°F | 14°F |
| Nemaha County | 92°F | 4°F |
| Neosho County | 95°F | 14°F |
| Ness County | 97°F | 7°F |
| Osage County | 94°F | 9°F |
| Osborne County | 97°F | 7°F |
| Ottawa County | 98°F | 10°F |
| Pawnee County | 97°F | 9°F |
| Pottawatomie County | 96°F | 8°F |
| Pratt County | 97°F | 11°F |
| Reno County | 97°F | 11°F |
| Rice County | 97°F | 11°F |
| Riley County | 96°F | 8°F |
| Rooks County | 98°F | 6°F |
| Rush County | 97°F | 7°F |
| Russell County | 97°F | 7°F |
| Saline County | 98°F | 10°F |
| Sedgwick County | 97°F | 13°F |
| Seward County | 98°F | 12°F |
| Shawnee County | 94°F | 9°F |
| Stafford County | 97°F | 11°F |
| Stanton County | 95°F | 9°F |
| Stevens County | 98°F | 12°F |
| Sumner County | 96°F | 14°F |
| Trego County | 98°F | 6°F |
| Wabaunsee County | 94°F | 9°F |
| Washington County | 95°F | 7°F |
| Wilson County | 95°F | 14°F |
| Woodson County | 95°F | 14°F |
| Wyandotte County | 93°F | 10°F |
Zone 5A: cool, humid (17 counties, 2% of people)
| County | Summer 1% | Winter 99% |
|---|---|---|
| Cheyenne County | 96°F | 5°F |
| Decatur County | 96°F | 4°F |
| Gove County | 98°F | 6°F |
| Greeley County | 99°F | 7°F |
| Jewell County | 95°F | 7°F |
| Logan County | 96°F | 5°F |
| Norton County | 98°F | 6°F |
| Phillips County | 98°F | 6°F |
| Rawlins County | 96°F | 5°F |
| Republic County | 95°F | 7°F |
| Scott County | 96°F | 8°F |
| Sheridan County | 96°F | 5°F |
| Sherman County | 95°F | 6°F |
| Smith County | 91°F | 4°F |
| Thomas County | 96°F | 5°F |
| Wallace County | 95°F | 6°F |
| Wichita County | 96°F | 8°F |
Climate data as of 2026-10. Design temperatures may differ by a few degrees from the ACCA Manual J tables your contractor uses; winter values run a little warmer because recent winters have been milder.