Wood County, WI Insulation Payback
Wood County, WI: what topping up your attic actually costs
DOE classifies Wood 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. 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 1.6 years at an estimated $2,174/year saved. That's about as fast as attic paybacks get.
Heating vs. cooling in Wood County
The estimated savings split roughly $2,094/year heating, $81/year cooling. Out of every 100 US counties tracked here, Wood County's savings potential beats roughly 89 of them. Within zone 6 specifically, it ranks 215th of 459 counties by estimated savings. Wisconsin averages $2,200/year across the counties tracked here; Wood County comes in 1% lower.
The climate data behind this
NOAA's WISCONSIN RAPIDS ALEXANDER FLD, WI US station, 12.2 miles from Wood County, supplies the 7,830 HDD and 502 CDD this estimate runs on. That combined heating-and-cooling load ranks Wood County 345th nationally by total degree days — the 89th percentile. Wood County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
Already have some insulation?
If Wood 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 $317/year — payback about 7.2 years. That is a solid payback as home upgrades go.
Quotes and materials for this job
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 Wood County's estimated $2,174/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.