Cavalier County, ND Insulation Payback
Cavalier County attic insulation, by the numbers
DOE classifies Cavalier County as climate zone 7, very cold — severe, long winters where heating is nearly the whole story. 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 $2,810 a year — payback in roughly 1.2 years. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $2,770 a year on the heating side, $40 on cooling. By estimated insulation savings, Cavalier County lands in the 99th percentile nationally. Zone 7 alone covers 120 counties in this dataset, and Cavalier County comes in 13th by savings. North Dakota averages $2,496/year across the counties tracked here; Cavalier County comes in 13% higher.
Where these numbers come from
Cavalier County's climate figures — 10,360 heating and 249 cooling degree days a year — are read from LANGDON EXP FARM, ND US, 5.4 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Cavalier County in the 99th percentile of this 3,162-county dataset.
If the attic isn't bare
If Cavalier 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 $410/year — payback about 5.6 years. Worth doing on the numbers alone.
Quotes and materials for this job
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 Cavalier County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Cavalier 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.