Eddy County, NM Insulation Payback
Eddy County attic insulation, by the numbers
DOE classifies Eddy County as climate zone 3, hot-dry — intense summer heat with low humidity, where attic radiant heat gain is the main driver. 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 2.6 years at an estimated $1,098/year saved. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $753 a year on the heating side, $345 on cooling. By estimated insulation savings, Eddy County lands in the 24th percentile nationally. Zone 3 alone covers 690 counties in this dataset, and Eddy County comes in 239th by savings. New Mexico averages $1,423/year across the counties tracked here; Eddy County comes in 23% lower.
Eddy County's actual weather, not a national average
Eddy County's climate figures — 2,838 heating and 2,164 cooling degree days a year — are read from BRANTLEY DAM, NM US, 6 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, Eddy County sits at the 26th percentile nationally. One local detail the R-value alone won't tell you: Eddy County sits in moisture regime B (dry), which can affect the vapor-barrier choice.
The smaller top-up scenario
Already have a few inches up there? Topping R-11 up to R-38 runs about $1,620 for about $148/year saved — roughly 11 years to break even. Call this borderline rather than a clear win.
Next steps for a Eddy 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 Eddy County's estimated $1,098/year on the line.
Where these figures come from
Eddy County's R-49 target and its degree-day figures both come from named federal sources - see the methodology guide for exactly which ones. The guide to what R-value actually means explains why R-49 is the target here specifically.