Hampshire County, MA Insulation Payback
Hampshire County, MA: what topping up your attic actually costs
DOE classifies Hampshire County as climate zone 5, cold — winters that dominate the energy bill, with cooling a minor factor. Its recommended attic R-value for bare joists is R-60. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-60 runs an estimated $3,480, and saves about $1,875 a year in heating and cooling — a payback around 1.9 years. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $1,782/year heating, $93/year cooling. Out of every 100 US counties tracked here, Hampshire County's savings potential beats roughly 76 of them. Within zone 5 specifically, it ranks 172nd of 745 counties by estimated savings. Massachusetts averages $1,728/year across the counties tracked here; Hampshire County comes in 9% higher.
The climate data behind this
NOAA's AMHERST, MA US station, 7.2 miles from Hampshire County, supplies the 6,664 HDD and 580 CDD this estimate runs on. That combined heating-and-cooling load ranks Hampshire County 769th nationally by total degree days — the 76th percentile. Hampshire 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
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $273/year saved — roughly 8.3 years to break even. This one is a genuine toss-up, not a clear yes.
Next steps for a Hampshire County attic
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $3,480 figure above as a planning number for Hampshire County, not a bid - contractors typically charge a $600 minimum regardless of job size.
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.