San Juan County, NM Insulation Payback
Is attic insulation worth it in San Juan County, NM?
DOE classifies San Juan 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. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-60 runs an estimated $3,480, and saves about $1,569 a year in heating and cooling — a payback around 2.2 years. Few home upgrades pay back that quickly.
Heating vs. cooling in San Juan County
Heating accounts for about $1,423/year of that and cooling about $146/year — San Juan County needs both. Nationally, San Juan County ranks in the 58th percentile for insulation savings potential. Compared only against its own climate zone, San Juan County places 675th out of 745. Against New Mexico's own average of $1,423/year, San Juan County runs 10% above that.
The climate data behind this
NOAA's FARMINGTON AG SCI CNT, NM US station, 12.3 miles from San Juan County, supplies the 5,321 HDD and 911 CDD this estimate runs on. That combined heating-and-cooling load ranks San Juan County 1368th nationally by total degree days — the 57th percentile. Its moisture regime is classified dry, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
If the attic isn't bare
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 $229/year saved (~10-year payback). Whether that is worth it depends on how long you plan to stay.
Next steps for a San Juan 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 San Juan County, not a bid - contractors typically charge a $600 minimum regardless of job size.
San Juan County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed San Juan County's numbers, and where the cost assumptions come from. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.