Luna County, NM Insulation Payback
Luna County attic insulation, by the numbers
DOE classifies Luna 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. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-49 runs an estimated $2,820, and saves about $1,060 a year in heating and cooling — a payback around 2.7 years. Topping up the attic pays for itself fast here.
Heating vs. cooling in Luna County
Split it out and it's roughly $773 a year on the heating side, $287 on cooling. By estimated insulation savings, Luna County lands in the 21th percentile nationally. Zone 3 alone covers 690 counties in this dataset, and Luna County comes in 334th by savings. New Mexico averages $1,423/year across the counties tracked here; Luna County comes in 26% lower.
The climate data behind this
Luna County's climate figures — 2,912 heating and 1,802 cooling degree days a year — are read from DEMING, NM US, 4.8 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Luna County in the 17th percentile of this 3,162-county dataset. One local detail the R-value alone won't tell you: Luna County sits in moisture regime B (dry), which can affect the vapor-barrier choice.
Already have some insulation?
Already have a few inches up there? Topping R-11 up to R-38 runs about $1,620 for about $143/year saved — roughly 11.3 years to break even. Call this borderline rather than a clear win.
Getting it done in Luna County
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $2,820 figure above as a planning number for Luna County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Luna 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.