Champaign County, IL Insulation Payback
Champaign County attic insulation, by the numbers
DOE classifies Champaign County as climate zone 5, cold — cold enough that heating, not cooling, is what decides the bill. Its recommended attic R-value for bare joists is R-60. Going from R-2 to the recommended R-60 costs roughly $3,480 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 2.1 years at an estimated $1,685/year saved. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $1,513 a year on the heating side, $172 on cooling. By estimated insulation savings, Champaign County lands in the 65th percentile nationally. Zone 5 alone covers 745 counties in this dataset, and Champaign County comes in 509th by savings. Illinois averages $1,642/year across the counties tracked here; Champaign County comes in 3% higher.
The climate data behind this
The heating and cooling degree days behind this estimate — 5,657 HDD and 1,073 CDD (base 65°F, 1991-2020 normals) — come from CHAMPAIGN 3S, IL US, the nearest NOAA station with published normals, 4.4 miles from Champaign County's center. Combined heating and cooling load puts Champaign County in the 66th percentile of this 3,162-county dataset. One local detail the R-value alone won't tell you: Champaign County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
Already have some insulation?
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $246/year saved — roughly 9.3 years to break even. Call this borderline rather than a clear win.
Next steps for a Champaign County attic
Real bids depend on how easy the attic is to reach and whether old insulation needs removing first, so treat $3,480 as a starting estimate for a Champaign County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Where these figures come from
Champaign County's R-60 target and its degree-day figures both come from named federal sources - see the methodology guide for exactly which ones. The guide to what R-value actually means explains why R-60 is the target here specifically.