Franklin County, IN Insulation Payback
Attic insulation payback for Franklin County, IN
Franklin 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 $1,578 a year in heating and cooling — a payback around 2.2 years. Hard to find a home improvement with a faster payback than this.
The breakdown behind the number
Of that, about $1,402/year comes from reduced heating and $175/year from reduced cooling load through the ceiling. Franklin County beats 58% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 745 counties DOE places in zone 5, Franklin County ranks 666th. Against Indiana's own average of $1,634/year, Franklin County runs 3% below that.
Franklin County's actual weather, not a national average
Franklin County's climate figures — 5,245 heating and 1,092 cooling degree days a year — are read from BROOKVILLE, IN US, 3 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Franklin County 1309th nationally by total degree days — the 59th percentile. DOE also classifies Franklin County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
Already have some insulation?
A shallower starting point changes the math: with R-11 already down, only the gap to R-49 needs filling, at roughly $2,280 for an estimated $230/year saved (~9.9-year payback). It is close - the payback only just fits a reasonable timeframe.
Next steps for a Franklin County attic
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 Franklin 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.