Grand County, CO Insulation Payback
Is attic insulation worth it in Grand County, CO?
Grand County, Colorado is zone 7 under DOE's climate map (Very Cold), which means severe, long winters where heating is nearly the whole story. 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 $2,611 a year — payback in roughly 1.3 years. Few home upgrades pay back that quickly.
Where the savings come from
Heating accounts for about $2,609/year of that and cooling about $3/year — Grand County needs both. Nationally, Grand County ranks in the 99th percentile for insulation savings potential. Compared only against its own climate zone, Grand County places 37th out of 120. Against Colorado's own average of $2,043/year, Grand County runs 28% above that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 9,756 HDD and 18 CDD (base 65°F, 1991-2020 normals) — come from WILLIAMS FORK DAM, CO US, the nearest NOAA station with published normals, 7.2 miles from Grand County's center. Combined heating and cooling load puts Grand County in the 98th percentile of this 3,162-county dataset.
The smaller top-up scenario
A shallower starting point changes the math: with R-11 already down, only the gap to R-49 needs filling, at roughly $2,280 for an estimated $381/year saved (~6-year payback). The math clears comfortably within a normal ownership horizon.
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 Grand County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Grand County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Grand 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.