Gilpin County, CO Insulation Payback
Gilpin County, CO: what topping up your attic actually costs
Gilpin County, Colorado is zone 5 under DOE's climate map (Cold), which means a real winter that drives most of the annual energy bill here. 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 1.4 years at an estimated $2,446/year saved. That's about as fast as attic paybacks get.
Heating vs. cooling in Gilpin County
The estimated savings split roughly $2,443/year heating, $3/year cooling. Out of every 100 US counties tracked here, Gilpin County's savings potential beats roughly 97 of them. Within zone 5 specifically, it ranks 2nd of 745 counties by estimated savings. Colorado averages $2,043/year across the counties tracked here; Gilpin County comes in 20% higher.
Where these numbers come from
Gilpin County's climate figures — 9,135 heating and 19 cooling degree days a year — are read from COAL CREEK CANYON, CO US, 8 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Gilpin County in the 96th percentile of this 3,162-county dataset. Gilpin County falls in DOE's moisture regime B (dry), a detail that affects vapor-barrier recommendations more than the R-value target itself.
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 $357/year saved (~6.4-year payback). That is a solid payback as home upgrades go.
Next steps for a Gilpin County attic
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 Gilpin County, not a bid - contractors typically charge a $600 minimum regardless of job size.
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.