Nelson County, ND Insulation Payback
Nelson County attic insulation, by the numbers
Nelson County sits in IECC climate zone 7 (Very Cold) — severe, long winters where heating is nearly the whole story. For a currently uninsulated attic, DOE and ENERGY STAR recommend building 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 1.3 years at an estimated $2,708/year saved. Topping up the attic pays for itself fast here.
Where the savings come from
Split it out and it's roughly $2,652 a year on the heating side, $55 on cooling. By estimated insulation savings, Nelson County lands in the 99th percentile nationally. Zone 7 alone covers 120 counties in this dataset, and Nelson County comes in 22nd by savings. North Dakota averages $2,496/year across the counties tracked here; Nelson County comes in 8% higher.
The climate data behind this
Nelson County's climate figures — 9,920 heating and 344 cooling degree days a year — are read from PETERSBURG 2 N, ND US, 12.1 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Nelson County 30th nationally by total degree days — the 99th percentile.
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 $395/year saved — roughly 5.8 years to break even. Worth doing on the numbers alone.
Getting it done in Nelson 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 Nelson County's estimated $2,708/year on the line.
Where these figures come from
Nelson County's R-60 target and its degree-day figures both come from named federal sources - see the methodology guide for exactly which ones. The guide to what R-value actually means explains why R-60 is the target here specifically.