Cochise County, AZ Insulation Payback
Cochise County, AZ: what topping up your attic actually costs
DOE classifies Cochise County as climate zone 3, hot-dry — desert-dry heat for much of the year, with the attic taking the brunt of it. Its recommended attic R-value for bare joists is R-49. Going from R-2 to the recommended R-49 costs roughly $2,820 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 2.8 years at an estimated $1,002/year saved. That's about as fast as attic paybacks get.
Where the savings come from
The estimated savings split roughly $750/year heating, $252/year cooling. Out of every 100 US counties tracked here, Cochise County's savings potential beats roughly 17 of them. Within zone 3 specifically, it ranks 467th of 690 counties by estimated savings. Arizona averages $1,149/year across the counties tracked here; Cochise County comes in 13% lower.
Where these numbers come from
Cochise County's climate figures — 2,827 heating and 1,582 cooling degree days a year — are read from PEARCE - SUNSITES, AZ US, 7.6 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Cochise County 2885th nationally by total degree days — the 9th percentile. Cochise 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?
A shallower starting point changes the math: with R-11 already down, only the gap to R-38 needs filling, at roughly $1,620 for an estimated $135/year saved (~12-year payback). This one is a genuine toss-up, not a clear yes.
Next steps for a Cochise 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 Cochise County's estimated $1,002/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-49 is the target here specifically.