Roberts County, SD Insulation Payback
Attic insulation payback for Roberts County, SD
DOE classifies Roberts County as climate zone 6, cold — cold enough that heating, not cooling, is what decides the bill. Its recommended attic R-value for bare joists is R-60. For an attic around 1,000 square feet, closing the gap from R-2 to R-60 costs around $3,480 and saves an estimated $2,278 a year — payback in roughly 1.5 years. Hard to find a home improvement with a faster payback than this.
Heating vs. cooling in Roberts County
Of that, about $2,187/year comes from reduced heating and $91/year from reduced cooling load through the ceiling. Roberts County beats 93% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 459 counties DOE places in zone 6, Roberts County ranks 113th. Against South Dakota's own average of $2,162/year, Roberts County runs 5% above that.
Where these numbers come from
NOAA's SISSETON MUNI AP, SD US station, 3.8 miles from Roberts County, supplies the 8,179 HDD and 566 CDD this estimate runs on. By total degree days, Roberts County sits at the 93th percentile nationally. DOE also classifies Roberts County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
Already have some insulation?
If Roberts 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 $332/year — payback about 6.9 years. Topping up the attic pays for itself here.
Getting it done in Roberts 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 Roberts 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.