Judith Basin County, MT Insulation Payback
Judith Basin County attic insulation, by the numbers
Judith Basin County sits in IECC climate zone 6 (Cold) — cold enough that heating, not cooling, is what decides the bill. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to 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 $2,096 a year — payback in roughly 1.7 years. Topping up the attic pays for itself fast here.
Where the savings come from
Split it out and it's roughly $2,051 a year on the heating side, $45 on cooling. By estimated insulation savings, Judith Basin County lands in the 86th percentile nationally. Zone 6 alone covers 459 counties in this dataset, and Judith Basin County comes in 297th by savings. Montana averages $2,182/year across the counties tracked here; Judith Basin County comes in 4% lower.
Where these numbers come from
The heating and cooling degree days behind this estimate — 7,671 HDD and 278 CDD (base 65°F, 1991-2020 normals) — come from STANFORD, MT US, the nearest NOAA station with published normals, 9.3 miles from Judith Basin County's center. Combined heating and cooling load puts Judith Basin County in the 85th percentile of this 3,162-county dataset. One local detail the R-value alone won't tell you: Judith Basin County sits in moisture regime B (dry), which can affect the vapor-barrier choice.
Already have some insulation?
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 $306/year saved (~7.5-year payback). Worth doing on the numbers alone.
Getting it done in Judith Basin County
Real bids depend on how easy the attic is to reach and whether old insulation needs removing first, so treat $3,480 as a starting estimate for a Judith Basin County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Where these figures come from
Judith Basin 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.