HVAC System Cost for a 1,500 Sqft Home in Illinois (2026)

2026 hvac system replacement cost for a 1,000–1,800 sqft home in Illinois. Climate + size-tier adjusted ranges and a free calculator.

2026 HVAC System costs in Illinois

National average is $7,500. Illinois's regional cost index (1.05×) puts the typical hvac system project at roughly $7,875. Low-end $5,250, high-end $13,125. Central heating and cooling system replacement including labor and materials.

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