Phillips County, CO Insulation Payback
Phillips County, CO: what topping up your attic actually costs
Phillips County, Colorado is zone 5 under DOE's climate map (Cold), which means cold enough that heating, not cooling, is what decides the bill. An uninsulated attic there should be built 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 1.9 years at an estimated $1,863/year saved. That's about as fast as attic paybacks get.
Heating vs. cooling in Phillips County
The estimated savings split roughly $1,750/year heating, $112/year cooling. Out of every 100 US counties tracked here, Phillips County's savings potential beats roughly 76 of them. Within zone 5 specifically, it ranks 187th of 745 counties by estimated savings. Colorado averages $2,043/year across the counties tracked here; Phillips County comes in 9% lower.
The climate data behind this
The heating and cooling degree days behind this estimate — 6,546 HDD and 700 CDD (base 65°F, 1991-2020 normals) — come from HOLYOKE, CO US, the nearest NOAA station with published normals, 3.4 miles from Phillips County's center. That combined heating-and-cooling load ranks Phillips County 768th nationally by total degree days — the 76th percentile. Phillips County falls in DOE's moisture regime B (dry), a detail that affects vapor-barrier recommendations more than the R-value target itself.
If the attic isn't bare
If Phillips 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 $272/year — payback about 8.4 years. This one is a genuine toss-up, not a clear yes.
Next steps for a Phillips County attic
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 Phillips County's estimated $1,863/year on the line.
Nothing here is a guess
Every figure on this page traces to DOE/IECC climate zones and NOAA degree-day normals, documented in the methodology guide. The guide to what R-value actually means explains why R-60 is the target here specifically.