Definition
A mixed-humid climate is a region with both a meaningful heating season and a hot, humid cooling season. The U.S. Department of Energy's Building America program defines it as more than 20 inches of annual precipitation, roughly 5,400 heating degree days or fewer, and winter monthly averages below 45°F. Kentucky falls in IECC Climate Zone 4A.
Also called: Climate Zone 4A, IECC Zone 4A, Mixed-humid climate
Why it matters to you.
In Central Kentucky, removing summer moisture matters as much as lowering temperature, while winter still brings real cold snaps. That two-sided climate is why system choices here weigh dehumidification and correct sizing alongside heating performance, and why heat pumps and dual-fuel systems fit many homes.
Practical guidance.
When comparing equipment, ask how each option handles summer humidity as well as winter heat, and request a load calculation that uses local design conditions. Equipment selection and sizing are contractor work; homeowners can help by tracking indoor humidity and noting rooms that feel clammy or cold.
About this definition
Written by the Feistritzer Heating & Air Conditioning team — family owned and operated in Danville since 1976, Kentucky HVAC license M02584. Definitions inform; a whole-system diagnosis in your home decides.