Adams County, PA Insulation Payback
Adams County, PA: what topping up your attic actually costs
DOE classifies Adams County as climate zone 5, cold — a real winter that drives most of the annual energy bill here. 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 $1,551 a year in heating and cooling — a payback around 2.2 years. That's about as fast as attic paybacks get.
Where the savings come from
The estimated savings split roughly $1,411/year heating, $140/year cooling. Out of every 100 US counties tracked here, Adams County's savings potential beats roughly 56 of them. Within zone 5 specifically, it ranks 692nd of 745 counties by estimated savings. Pennsylvania averages $1,724/year across the counties tracked here; Adams County comes in 10% lower.
Where these numbers come from
The heating and cooling degree days behind this estimate — 5,277 HDD and 871 CDD (base 65°F, 1991-2020 normals) — come from EISENHOWER NHS, PA US, the nearest NOAA station with published normals, 4.5 miles from Adams County's center. That combined heating-and-cooling load ranks Adams County 1429th nationally by total degree days — the 55th percentile. Adams 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
If Adams 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 $226/year — payback about 10.1 years. This one is a genuine toss-up, not a clear yes.
Quotes and materials for this job
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 Adams 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.