Norfolk County, MA Insulation Payback
Norfolk County, MA: what topping up your attic actually costs
Norfolk 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 2.2 years at an estimated $1,614/year saved. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $1,481/year heating, $133/year cooling. Out of every 100 US counties tracked here, Norfolk County's savings potential beats roughly 60 of them. Within zone 5 specifically, it ranks 624th of 745 counties by estimated savings. Massachusetts averages $1,728/year across the counties tracked here; Norfolk County comes in 7% lower.
Where these numbers come from
The heating and cooling degree days behind this estimate — 5,540 HDD and 828 CDD (base 65°F, 1991-2020 normals) — come from NORWOOD MEM AP, MA US, the nearest NOAA station with published normals, 1.4 miles from Norfolk County's center. Combined heating and cooling load puts Norfolk County in the 59th percentile of this 3,162-county dataset. Norfolk County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
If the attic isn't bare
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 $235/year saved (~9.7-year payback). This one is a genuine toss-up, not a clear yes.
Getting it done in Norfolk 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 Norfolk County's estimated $1,614/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.