Grant County, ND Insulation Payback
Is attic insulation worth it in Grant County, ND?
Grant County, North Dakota is zone 6 under DOE's climate map (Cold), which means cold enough that heating, not cooling, is what decides the bill. An uninsulated attic there should be built 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 $2,399 a year — payback in roughly 1.5 years. Few home upgrades pay back that quickly.
The breakdown behind the number
Heating accounts for about $2,330/year of that and cooling about $69/year — Grant County needs both. Nationally, Grant County ranks in the 96th percentile for insulation savings potential. Compared only against its own climate zone, Grant County places 31st out of 459. Against North Dakota's own average of $2,496/year, Grant County runs 4% below that.
Grant County's actual weather, not a national average
Grant County's climate figures — 8,714 heating and 428 cooling degree days a year — are read from CARSON, ND US, 5.6 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Grant County 131st nationally by total degree days — the 96th percentile. Its moisture regime is classified humid, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
Already have some insulation?
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $350/year saved — roughly 6.5 years to break even. The math clears comfortably within a normal ownership horizon.
Next steps for a Grant 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 Grant County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Grant County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Grant County's numbers, and where the cost assumptions come from. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.