Lawrence County, IL Insulation Payback
Attic insulation payback for Lawrence County, IL
DOE classifies Lawrence County as climate zone 4, mixed-humid — heating load in winter and cooling load in summer, both worth taking seriously here. 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 2.3 years at an estimated $1,525/year saved. Hard to find a home improvement with a faster payback than this.
Heating vs. cooling in Lawrence County
Of that, about $1,318/year comes from reduced heating and $207/year from reduced cooling load through the ceiling. Lawrence County beats 54% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 825 counties DOE places in zone 4, Lawrence County ranks 137th. Against Illinois's own average of $1,642/year, Lawrence County runs 7% below that.
The climate data behind this
Lawrence County's climate figures — 4,929 heating and 1,291 cooling degree days a year — are read from LAWRENCEVILLE 2WSW, IL US, 0.7 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, Lawrence County sits at the 57th percentile nationally. DOE also classifies Lawrence County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
If the attic isn't bare
If Lawrence County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-49. That smaller top-up costs around $2,280 and saves an estimated $222/year — payback about 10.2 years. It is close - the payback only just fits a reasonable timeframe.
Getting it done in Lawrence County
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $3,480 figure above as a planning number for Lawrence County, not a bid - contractors typically charge a $600 minimum regardless of job size.
More on how this was built
Nothing here is a guess: the methodology guide names the DOE climate map and NOAA station data behind every number on this page. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.