Shelby County, IN Insulation Payback
Attic insulation payback for Shelby County, IN
Shelby County sits in IECC climate zone 5 (Cold) — winters that dominate the energy bill, with cooling a minor factor. 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 $1,612 a year in heating and cooling — a payback around 2.2 years. Hard to find a home improvement with a faster payback than this.
Where the savings come from
Of that, about $1,453/year comes from reduced heating and $159/year from reduced cooling load through the ceiling. Shelby County beats 60% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 745 counties DOE places in zone 5, Shelby County ranks 629th. Against Indiana's own average of $1,634/year, Shelby County runs 1% below that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 5,436 HDD and 989 CDD (base 65°F, 1991-2020 normals) — come from SHELBYVILLE SEWAGE PLT, IN US, the nearest NOAA station with published normals, 0.3 miles from Shelby County's center. That combined heating-and-cooling load ranks Shelby County 1255th nationally by total degree days — the 60th percentile. DOE also classifies Shelby 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
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $235/year saved — roughly 9.7 years to break even. It is close - the payback only just fits a reasonable timeframe.
Getting it done in Shelby County
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 Shelby County job, not a quote. Expect at least a $600 minimum charge from most contractors.
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.