Mono County, CA Insulation Payback
Mono County attic insulation, by the numbers
DOE classifies Mono County as climate zone 6, cold — a real winter that drives most of the annual energy bill here. Its recommended attic R-value for bare joists is R-60. For an attic around 1,000 square feet, closing the gap from R-2 to R-60 costs around $3,480 and saves an estimated $1,715 a year — payback in roughly 2 years. Topping up the attic pays for itself fast here.
Heating vs. cooling in Mono County
Split it out and it's roughly $1,667 a year on the heating side, $48 on cooling. By estimated insulation savings, Mono County lands in the 67th percentile nationally. Zone 6 alone covers 459 counties in this dataset, and Mono County comes in 459th by savings. California averages $1,056/year across the counties tracked here; Mono County comes in 62% higher.
Mono County's actual weather, not a national average
Mono County's climate figures — 6,236 heating and 299 cooling degree days a year — are read from LEE VINING, CA US, 13.6 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Mono County in the 62th percentile of this 3,162-county dataset. One local detail the R-value alone won't tell you: Mono County sits in moisture regime B (dry), which can affect the vapor-barrier choice.
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 $250/year saved (~9.1-year payback). Call this borderline rather than a clear win.
Getting it done in Mono County
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 Mono County's estimated $1,715/year on the line.
Where these figures come from
Mono County's R-60 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-60 is the target here specifically.