Larimer County, CO Insulation Payback
Is attic insulation worth it in Larimer County, CO?
DOE classifies Larimer County as climate zone 5, cold — cold enough that heating, not cooling, is what decides the bill. Its recommended attic R-value for bare joists is R-60. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-60 runs an estimated $3,480, and saves about $2,689 a year in heating and cooling — a payback around 1.3 years. Few home upgrades pay back that quickly.
Heating vs. cooling in Larimer County
Heating accounts for about $2,688/year of that and cooling about $1/year — Larimer County needs both. Nationally, Larimer County ranks in the 99th percentile for insulation savings potential. Compared only against its own climate zone, Larimer County places 1st out of 745. Against Colorado's own average of $2,043/year, Larimer County runs 32% above that.
Larimer County's actual weather, not a national average
The heating and cooling degree days behind this estimate — 10,054 HDD and 6 CDD (base 65°F, 1991-2020 normals) — come from HOURGLASS RSVR, CO US, the nearest NOAA station with published normals, 9.2 miles from Larimer County's center. That combined heating-and-cooling load ranks Larimer County 39th nationally by total degree days — the 99th percentile. Its moisture regime is classified dry, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
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 $392/year saved — roughly 5.8 years to break even. The math clears comfortably within a normal ownership horizon.
Next steps for a Larimer 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 Larimer County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Larimer County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Larimer 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.