Rockingham County, NH Insulation Payback
Rockingham County, NH: what topping up your attic actually costs
Rockingham County sits in IECC climate zone 5 (Cold) — a real winter that drives most of the annual energy bill here. 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 $1,916/year saved. That's about as fast as attic paybacks get.
Where the savings come from
The estimated savings split roughly $1,836/year heating, $80/year cooling. Out of every 100 US counties tracked here, Rockingham County's savings potential beats roughly 78 of them. Within zone 5 specifically, it ranks 129th of 745 counties by estimated savings. New Hampshire averages $2,071/year across the counties tracked here; Rockingham County comes in 7% lower.
The climate data behind this
Rockingham County's climate figures — 6,865 heating and 499 cooling degree days a year — are read from EPPING, NH US, 3 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Rockingham County in the 77th percentile of this 3,162-county dataset. Rockingham 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 Rockingham 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 $279/year — payback about 8.2 years. This one is a genuine toss-up, not a clear yes.
Quotes and materials for this job
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 Rockingham County job, not a quote. Expect at least a $600 minimum charge from most contractors.
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.