Iroquois County, IL Insulation Payback
Is attic insulation worth it in Iroquois County, IL?
Iroquois County sits in IECC climate zone 5 (Cold) — a real winter that drives most of the annual energy bill here. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to R-60. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-60 runs an estimated $3,480, and saves about $1,760 a year in heating and cooling — a payback around 2 years. Few home upgrades pay back that quickly.
The breakdown behind the number
Heating accounts for about $1,617/year of that and cooling about $143/year — Iroquois County needs both. Nationally, Iroquois County ranks in the 70th percentile for insulation savings potential. Compared only against its own climate zone, Iroquois County places 367th out of 745. Against Illinois's own average of $1,642/year, Iroquois County runs 7% above that.
The climate data behind this
Iroquois County's climate figures — 6,047 heating and 892 cooling degree days a year — are read from WATSEKA 2 NW, IL US, 5.2 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, Iroquois County sits at the 70th percentile nationally. Its moisture regime is classified humid, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
The smaller top-up scenario
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $257/year saved — roughly 8.9 years to break even. Whether that is worth it depends on how long you plan to stay.
Next steps for a Iroquois County attic
Get more than one quote before committing. Attic access and any needed air sealing move the price around, and most contractors won't take a job below roughly $600 regardless of size - worth asking upfront given Iroquois County's estimated $1,760/year on the line.
Iroquois County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Iroquois County's numbers, and where the cost assumptions come from. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.