Coconino County, AZ Insulation Payback
Coconino County, AZ: what topping up your attic actually costs
DOE classifies Coconino County as climate zone 5, cold — a real winter that drives most of the annual energy bill here. Its recommended attic R-value for bare joists is 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 2.1 years at an estimated $1,666/year saved. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $1,580/year heating, $85/year cooling. Out of every 100 US counties tracked here, Coconino County's savings potential beats roughly 64 of them. Within zone 5 specifically, it ranks 541st of 745 counties by estimated savings. Arizona averages $1,149/year across the counties tracked here; Coconino County comes in 45% higher.
The climate data behind this
Coconino County's climate figures — 5,911 heating and 531 cooling degree days a year — are read from GRAND CANYON E ENTRANCE, AZ US, 14.6 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Coconino County 1242nd nationally by total degree days — the 61th percentile. Coconino County falls in DOE's moisture regime B (dry), a detail that affects vapor-barrier recommendations more than the R-value target itself.
Already have some insulation?
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $243/year saved — roughly 9.4 years to break even. This one is a genuine toss-up, not a clear yes.
Getting it done in Coconino County
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 Coconino 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.