Martin County, IN Insulation Payback
Attic insulation payback for Martin County, IN
Martin County, Indiana is zone 4 under DOE's climate map (Mixed-Humid), which means real heating and real cooling seasons both, roughly balanced across the year. An uninsulated attic there should be built up to 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 2.4 years at an estimated $1,470/year saved. Hard to find a home improvement with a faster payback than this.
Where the savings come from
Of that, about $1,259/year comes from reduced heating and $211/year from reduced cooling load through the ceiling. Martin County beats 51% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 825 counties DOE places in zone 4, Martin County ranks 234th. Against Indiana's own average of $1,634/year, Martin County runs 10% below that.
The climate data behind this
Martin County's climate figures — 4,708 heating and 1,313 cooling degree days a year — are read from SHOALS 8 S, IN US, 10.5 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, Martin County sits at the 52th percentile nationally. DOE also classifies Martin 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 $214/year saved — roughly 10.6 years to break even. It is close - the payback only just fits a reasonable timeframe.
Getting it done in Martin County
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 Martin County's estimated $1,470/year on the line.
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.