Sioux County, ND Insulation Payback
Attic insulation payback for Sioux County, ND
Sioux County sits in IECC climate zone 6 (Cold) — cold enough that heating, not cooling, is what decides the bill. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to 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 $2,340 a year — payback in roughly 1.5 years. Hard to find a home improvement with a faster payback than this.
Heating vs. cooling in Sioux County
Of that, about $2,253/year comes from reduced heating and $87/year from reduced cooling load through the ceiling. Sioux County beats 94% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 459 counties DOE places in zone 6, Sioux County ranks 70th. Against North Dakota's own average of $2,496/year, Sioux County runs 6% below that.
Sioux County's actual weather, not a national average
NOAA's BREIEN, ND US station, 19.5 miles from Sioux County, supplies the 8,425 HDD and 542 CDD this estimate runs on. By total degree days, Sioux County sits at the 95th percentile nationally. DOE also classifies Sioux County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
The smaller top-up scenario
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $341/year saved — roughly 6.7 years to break even. Topping up the attic pays for itself here.
Next steps for a Sioux County attic
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 Sioux 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.