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Archdale, NC
3 miles northeast
Median home built 1986 (Trinity: 1979)
Insulation contractor serving ArchdaleAttic Insulation in Trinity, NC
Blown-in attic insulation for Trinity, NC, 3 miles from Archdale, plus removal and air sealing.
About Trinity and Its Homes
Trinity is named for Trinity College, which Methodist and Quaker farm families began as a small subscription school and which left for Durham in 1892 to grow into Duke University. Census figures shown on this page place most of its homes in 1970 or later, and little has been written about its older houses.
Trinity, in Randolph County, grew from 7,046 people in 2020 to 7,274 in 2025 (Census Bureau estimates), on 16.9 square miles. That makes Trinity the third-largest town in Randolph County.
Trinity has about 2,800 housing units, 5 percent of Randolph County's; about 80 percent of the city's households own their home.
Trinity at a Glance
- County: Randolph County
- Population: 7,274 (2025), 7,046 (2020), up 3.2%
- Land area: 16.9 square miles (431 people each)
- Housing units: about 2,800 (±268)
- Median year built: 1979 (±3); Randolph County: 1985
- Owner-occupied: 80% (±7); Randolph County: 73%
- Detached houses: 86% (±7); Randolph County: 68%
- Attached houses: 3% (±3)
- Apartments: under 4%
- Mobile homes: 9% (±5)
- Climate zone: 3 on both maps
- ENERGY STAR target for Trinity attics: R-49 from bare, R-38 over 3 to 4 inches (R-value guide)
Census Bureau estimates for Trinity, 2020 to 2024 (± margin of error).
Attic Insulation in Trinity
About 25 percent of Trinity's homes predate 1970; if your joists show above the insulation, ENERGY STAR says to add more insulation.
Built from 1970 to 1989, about 45 percent of Trinity homes may hold settled fiberglass; check its depth against the joists.
The Local Climate
Trinity's center sits about 800 feet above sea level, 5 miles from NOAA's High Point station, the best match for Trinity. The station's 1991 to 2020 normals average about 3,120 heating and 1,710 cooling degree days a year, so at Trinity's station, heating needs outweigh cooling.
Readings change over short distances around Trinity: NOAA's Lexington station, 15 miles away, averages about 3,500 heating degree days.
Homes by Age: What It Means for the Attic
About 86 percent of Trinity housing units are detached single-family houses.
Built from 1940 to 1969, 22 percent of Trinity homes often have little insulation.
About 55 percent of Trinity's housing units predate 1980; nearly all predate the state's 1978 insulation rule too.
Homes by Year Built
- Before 1940: 4% (±3), about 105 units
- 1940s: 2% (±2), about 70 units
- 1950s: 7% (±3), about 195 units
- 1960s: 13% (±4), about 360 units
- 1970s: 28% (±6), about 790 units
- 1980s: 17% (±6), about 470 units
- 1990s: 6% (±4), about 185 units
- 2000s: 9% (±4), about 255 units
- 2010s: 14% (±4), about 390 units
- 2020 or later: under 2%, about 25 units
Air Sealing and Duct Sealing in Trinity
In Trinity, 73 percent of homes heat with electricity; where that heat is forced air, ducts often run through the attic.
Air sealing comes first, as the EPA advises: wire and pipe holes, wall tops and soffits.
How Homes Here Are Heated
- Electricity: 73% (±6), about 1,970 households; Randolph County: 71%
- Piped gas: 17% (±5), about 460 households
- Bottled or tank gas: 2% (±1), about 45 households
- Oil or kerosene: 5% (±5), about 145 households
- Wood: 1% (±1), about 30 households
Power, Gas and Rebates
Duke Energy supplies Trinity's electricity. For gas, Trinity is in the Randolph County franchise of Piedmont Natural Gas, and 17 percent of the city's homes heat with piped gas. Duke's free House Call fits many Trinity homes: 73 percent heat with electricity.
Rebate to check in Trinity: Smart $aver Insulate and Seal (Duke Energy; Insulation Pros is an approved trade ally). Before a job in Trinity, check its current terms; the Randolph County page lists every program.
Attic Insulation Removal in Trinity
In a Trinity attic, only wet, moldy or animal-soiled insulation is vacuumed out (ENERGY STAR's test), once the cause is fixed, and after mice that Trinity attic is sanitized and deodorized; dry, clean insulation stays.
Also Serving Near Trinity
Nearest to Trinity first.
Thomasville, NC
4 miles west
Median home built 1983 (Trinity: 1979); Power from Duke Energy Carolinas (Trinity: Duke Energy)
Insulation contractor serving ThomasvilleHigh Point, NC
8 miles north
Median home built 1989 (Trinity: 1979); Power from its own town system (Trinity: Duke Energy)
Insulation contractor serving High PointRandleman, NC
12 miles east
Its NOAA station logs about 590 more heating degree days than Trinity's
Attic insulation in Randleman
Trinity Insulation FAQs
Is any part of Trinity on the National Register?
No, nothing inside the town limits. The one listing that carries the town's name, the Harper House from about 1815, is labeled vicinity on the state list, so it stands outside the town limits. The college that gave the town its name moved away in 1892 and left no listed campus behind. Randolph County keeps a landmark commission, named on the state's 2023 list of local boards. Its review covers outside changes to designated landmarks, while attic insulation happens indoors.
What needs a look before insulating one of the older houses here?
The wires, the brick and the roof. The town was incorporated in 1869, so a few houses may be old enough for porcelain knob-and-tube circuits from before about 1930. Those are unsafe to bury in loose fill, and an electrician deals with them first. An old brick flue in the ceiling gets its gap covered in aluminum and sealed with high-heat caulk. Sheet metal then rings the brick so no fill touches it. Last comes the roof: a damp spot in the old layer means a leak that the roofer repairs before any work starts.
Does attic insulation in Trinity need a permit?
Trinity City Hall can say whether Randolph County Building Inspections, the city itself or another office handles permits in Trinity; ask before work starts.
Helpful Guides
- Power from Duke Energy: high summer electric bills and home energy audits
Sources
Census Bureau figures for Trinity, NOAA normals for the High Point station, Duke Energy (October 2026). Compiled by Insulation Pros. How the town pages are made.
Sources for the Trinity introduction and questions (read October 20, 2026):
- Trinity College, NCpedia (State Library of North Carolina)
- Trinity, in The North Carolina Gazetteer (William S. Powell, 2nd ed., UNC Press 2010), NCpedia
- Year Structure Built (table B25034), Trinity city, American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau via Census Reporter
- Architectural Survey Status, Records, and Reports (survey reports by county), NC State Historic Preservation Office
- NC Listings in the National Register of Historic Places, NC State Historic Preservation Office
- Harper House (Trinity vicinity), National Register nomination (NC HPO)
- Historic Preservation Commission Staff in North Carolina, listed by county, as of 2/20/2023 (NC HPO)
- Attic Insulation Project, ENERGY STAR
- Furnace Flues Require Special Sealing Techniques, ENERGY STAR do-it-yourself guide
Trinity, NC
Open in Google Maps (opens in a new tab)Serving Trinity, NC
Insulation Pros is an insulation contractor serving North Carolina, Trinity and the rest of Randolph County included.
Reach us
Send the square footage of your Trinity attic, or call (336) 870-3893.