Gem County, ID Insulation Payback
Attic insulation payback for Gem County, ID
Gem County sits in IECC climate zone 5 (Cold) — winters that dominate the energy bill, with cooling a minor factor. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to 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 $1,874 a year in heating and cooling — a payback around 1.9 years. Hard to find a home improvement with a faster payback than this.
The breakdown behind the number
Of that, about $1,794/year comes from reduced heating and $79/year from reduced cooling load through the ceiling. Gem County beats 76% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 745 counties DOE places in zone 5, Gem County ranks 173rd. Against Idaho's own average of $1,995/year, Gem County runs 6% below that.
Gem County's actual weather, not a national average
Gem County's climate figures — 6,711 heating and 493 cooling degree days a year — are read from OLA, ID US, 9.8 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Gem County in the 75th percentile of this 3,162-county dataset. DOE also classifies Gem County as moisture regime B (dry) - ask a local contractor whether that changes the vapor-barrier approach for this job.
If the attic isn't bare
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $273/year saved — roughly 8.3 years to break even. It is close - the payback only just fits a reasonable timeframe.
Getting it done in Gem County
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 Gem County, not a bid - contractors typically charge a $600 minimum regardless of job size.
More on how this was built
Nothing here is a guess: the methodology guide names the DOE climate map and NOAA station data behind every number on this page. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.