Midwestern US
12 states from Ohio to Kansas. Heavy heating seasons, deep-freeze flue crystallization, and a high prevalence of pre-1950 masonry chimneys.
10 states · 0 active.
Ohio
OHHumid continental — pre-WWII brick chimney stock dominates.
Indiana
INHumid continental — heavy heating season.
Illinois
ILCold lake-effect winters around Chicago — heavy creosote.
Michigan
MIHeavy snow load, long heating season — crown failures common.
Wisconsin
WISevere winters — heaviest creosote loads east of the Mississippi.
Minnesota
MNDeep freeze winters — chase-flashing + flue tile shifts.
Iowa
IAHumid continental — heavy farm-region wood-burning.
Missouri
MOHumid continental — mixed urban + rural patterns.
Kansas
KSHot summers + cold winters — heavy freeze-thaw.
Nebraska
NEContinental — wide temp swings.
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