McLean County, ND Insulation Payback
Is attic insulation worth it in McLean County, ND?
DOE classifies McLean County as climate zone 7, very cold — a climate where the heating season stretches across most of the year. Its recommended attic R-value for bare joists is 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 1.4 years at an estimated $2,466/year saved. Few home upgrades pay back that quickly.
Where the savings come from
Heating accounts for about $2,395/year of that and cooling about $71/year — McLean County needs both. Nationally, McLean County ranks in the 97th percentile for insulation savings potential. Compared only against its own climate zone, McLean County places 76th out of 120. Against North Dakota's own average of $2,496/year, McLean County runs 1% below that.
The climate data behind this
McLean County's climate figures — 8,957 heating and 441 cooling degree days a year — are read from GARRISON, ND US, 0.1 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts McLean County in the 97th percentile of this 3,162-county dataset.
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 $360/year saved — roughly 6.3 years to break even. The math clears comfortably within a normal ownership horizon.
Next steps for a McLean 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 McLean County, not a bid - contractors typically charge a $600 minimum regardless of job size.
McLean County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed McLean 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.