Jasper County, IA Insulation Payback
Jasper County attic insulation, by the numbers
Jasper County sits in IECC climate zone 5 (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. Going from R-2 to the recommended R-60 costs roughly $3,480 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 1.8 years at an estimated $1,957/year saved. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $1,819 a year on the heating side, $138 on cooling. By estimated insulation savings, Jasper County lands in the 80th percentile nationally. Zone 5 alone covers 745 counties in this dataset, and Jasper County comes in 85th by savings. Iowa averages $1,985/year across the counties tracked here; Jasper County comes in 1% lower.
The climate data behind this
The heating and cooling degree days behind this estimate — 6,803 HDD and 862 CDD (base 65°F, 1991-2020 normals) — come from NEWTON, IA US, the nearest NOAA station with published normals, 2.2 miles from Jasper County's center. That combined heating-and-cooling load ranks Jasper County 586th nationally by total degree days — the 81th percentile. One local detail the R-value alone won't tell you: Jasper County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
If the attic isn't bare
If Jasper County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-49. That smaller top-up costs around $2,280 and saves an estimated $286/year — payback about 8 years. Worth doing on the numbers alone.
Getting it done in Jasper 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 Jasper County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Where these figures come from
Jasper 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.