Ohio Climate Zone 5A has a long, cold heating season (-5°F to 90°F swings) and humid summers. Air leakage during winter matters more here than in milder climates. Foam addresses heating-season losses and summer humidity in one product.
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Columbus sits at the intersection of three climate factors that amplify foam value. (1) Heating-degree-days run 5,500-5,800 annually, several hundred more than Cincinnati to the south; any winter air leakage is expensive heating fuel. (2) Cooling-degree-days run 1,000-1,200 with summer dew points in the mid-to-high 60s; air leakage during humid weather brings in latent cooling load that the AC must remove. (3) Pre-1980 Columbus housing stock typically has empty wall cavities, R-7 to R-19 attic insulation, and zero rim-joist insulation, giving large gaps to close. Combined effect: a Columbus home pre-foam often runs 7-12 ACH50 on blower-door measurement; post-foam typically 3-5 ACH50, a 50-65% reduction in air leakage. Cooler climate markets (Minneapolis, Boston) get a bit more raw R-value benefit, but Columbus Zone 5A already sits firmly in the cold-climate band where the heating-season air-seal benefit dominates. Warmer markets (Atlanta, Phoenix) skip the air-seal benefit because temperature differentials are smaller. Columbus hits a strong combination where both axes matter and heating leads. Columbus Climate-Zone-5A summary: the combination of a long cold heating season with significant air-leakage costs, humid summers with meaningful latent cooling load, and pre-1980 housing stock with empty wall cavities and minimal attic insulation produces conditions where foam delivers larger absolute savings per dollar than in milder markets. Greater Columbus is among the strongest US foam-retrofit value markets, alongside cities like Pittsburgh, Cleveland, Indianapolis, and Kansas City.