Northampton County, VA Insulation Payback
Northampton County attic insulation, by the numbers
Northampton County sits in IECC climate zone 4 (Mixed-Humid) — heating load in winter and cooling load in summer, both worth taking seriously 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 2.9 years at an estimated $1,212/year saved. Topping up the attic pays for itself fast here.
Heating vs. cooling in Northampton County
Split it out and it's roughly $991 a year on the heating side, $221 on cooling. By estimated insulation savings, Northampton County lands in the 32th percentile nationally. Zone 4 alone covers 825 counties in this dataset, and Northampton County comes in 736th by savings. Virginia averages $1,342/year across the counties tracked here; Northampton County comes in 10% lower.
Where these numbers come from
Northampton County's climate figures — 3,706 heating and 1,374 cooling degree days a year — are read from CAPE CHARLES 5 ENE, VA US, 0.8 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, Northampton County sits at the 28th percentile nationally. One local detail the R-value alone won't tell you: Northampton County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
Already have some insulation?
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 $177/year saved (~12.9-year payback). Call this borderline rather than a clear win.
Getting it done in Northampton County
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 Northampton County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Where these figures come from
Northampton County's R-60 target and its degree-day figures both come from named federal sources - see the methodology guide for exactly which ones. The guide to what R-value actually means explains why R-60 is the target here specifically.