Montgomery County, IA Insulation Payback
Montgomery County, IA: what topping up your attic actually costs
Montgomery 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 1.9 years at an estimated $1,829/year saved. That's about as fast as attic paybacks get.
Heating vs. cooling in Montgomery County
The estimated savings split roughly $1,659/year heating, $170/year cooling. Out of every 100 US counties tracked here, Montgomery County's savings potential beats roughly 74 of them. Within zone 5 specifically, it ranks 245th of 745 counties by estimated savings. Iowa averages $1,985/year across the counties tracked here; Montgomery County comes in 8% lower.
Where these numbers come from
Montgomery County's climate figures — 6,205 heating and 1,057 cooling degree days a year — are read from RED OAK, IA US, 4.6 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Montgomery County 757th nationally by total degree days — the 76th percentile. Montgomery County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
The smaller top-up scenario
If Montgomery 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 $267/year — payback about 8.5 years. This one is a genuine toss-up, not a clear yes.
Getting it done in Montgomery 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 Montgomery County's estimated $1,829/year on the line.
Nothing here is a guess
Every figure on this page traces to DOE/IECC climate zones and NOAA degree-day normals, documented in the methodology guide. The guide to what R-value actually means explains why R-60 is the target here specifically.