Newport County, RI Insulation Payback
Is attic insulation worth it in Newport County, RI?
DOE classifies Newport County as climate zone 5, cold — cold enough that heating, not cooling, is what decides the bill. Its recommended attic R-value for bare joists is R-60. For an attic around 1,000 square feet, closing the gap from R-2 to R-60 costs around $3,480 and saves an estimated $1,568 a year — payback in roughly 2.2 years. Few home upgrades pay back that quickly.
The breakdown behind the number
Heating accounts for about $1,476/year of that and cooling about $92/year — Newport County needs both. Nationally, Newport County ranks in the 57th percentile for insulation savings potential. Compared only against its own climate zone, Newport County places 677th out of 745. Against Rhode Island's own average of $1,664/year, Newport County runs 6% below that.
Newport County's actual weather, not a national average
The heating and cooling degree days behind this estimate — 5,520 HDD and 574 CDD (base 65°F, 1991-2020 normals) — come from NEWPORT STATE AP, RI US, the nearest NOAA station with published normals, 2.2 miles from Newport County's center. By total degree days, Newport County sits at the 54th percentile nationally. Its moisture regime is classified humid, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
If the attic isn't bare
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $229/year saved — roughly 10 years to break even. Whether that is worth it depends on how long you plan to stay.
Quotes and materials for this job
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 Newport County's estimated $1,568/year on the line.
Newport County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Newport County's numbers, and where the cost assumptions come from. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.