Murray County, OK Insulation Payback
Is attic insulation worth it in Murray County, OK?
Murray County sits in IECC climate zone 3 (Mixed-Humid) — heating load in winter and cooling load in summer, both worth taking seriously here. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to 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 $1,195 a year in heating and cooling — a payback around 2.4 years. Few home upgrades pay back that quickly.
The breakdown behind the number
Heating accounts for about $870/year of that and cooling about $325/year — Murray County needs both. Nationally, Murray County ranks in the 31th percentile for insulation savings potential. Compared only against its own climate zone, Murray County places 102nd out of 690. Against Oklahoma's own average of $1,260/year, Murray County runs 5% below that.
Murray County's actual weather, not a national average
The heating and cooling degree days behind this estimate — 3,280 HDD and 2,038 CDD (base 65°F, 1991-2020 normals) — come from CHICKASAW NRA, OK US, the nearest NOAA station with published normals, 5.8 miles from Murray County's center. Combined heating and cooling load puts Murray County in the 35th percentile of this 3,162-county dataset. Its moisture regime is classified humid, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
Already have some insulation?
Already have a few inches up there? Topping R-11 up to R-38 runs about $1,620 for about $161/year saved — roughly 10.1 years to break even. Whether that is worth it depends on how long you plan to stay.
Getting it done in Murray 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 Murray County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Murray County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Murray 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.