AC & heating repair · Duluth, Georgia
AC repair and HVAC service in Duluth, GA
AC quit, heat pump struggling, or a system near the end of its life? In Duluth, 34% of homes heat with electricity[1] and half were built before 1994. Request service from HVAC contractors working here. Duluth, in Gwinnett County — ZIPs 30096, 30097, counts 33,815 residents (2025 estimate)[2].
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Duluth HVAC snapshot: the key figures
- Population (2025 est.)
- 33,815[2]+4.9% since 2020
- County
- Gwinnett[2]
- Land area
- 10.3 sq mi[3]
- Homes heated with electricity
- 34%[1]the 5th-lowest share of the 15 Atlanta-area suburbs we cover
- Homes heated with utility gas
- 64%[1]plus 1% propane/LP
- Heat & excessive-heat days, gwinnett zone
- 0[4]2016–2025
- Winter-storm & freeze days, gwinnett zone
- 10[4]2016–2025; heating demand and freeze-related furnace failures
- Lightning-damage reports within 10 mi
- 8[4]2016–2025; power surges damage HVAC control boards
- Damaging-wind reports within 10 mi
- 95[4]2016–2025; wind-blown debris damages outdoor condenser units
- Homes built before 2000
- 70%[1]of 13,841 housing units
- Median year built
- 1994[1]the 8th-newest of the 15 Atlanta-area suburbs we cover
Reading the Duluth data for HVAC
Duluth counts 33,815 residents (2025 estimate), growing at a middle-of-the-pack 4.9% since 2020[2]. The city spans 10.3 square miles at 3,281 residents per square mile (the 4th densest) and sits entirely in Gwinnett County, served by ZIP codes 30096, 30097[3].
Only 14% of Duluth's homes were built in 2010 or later, against 70% before 2000[1] — most systems here are past any builder warranty, and older homes often keep their original ductwork.
Mail to Duluth goes through 2 ZIP codes — 30096 (71% of the city's land), 30097 (26% of the city's land)[5].
Nearest of the other suburbs we track: Johns Creek (3.7 mi NW), Alpharetta (8.5 mi NW) and Lawrenceville (9.7 mi E)[3].
34% of occupied Duluth homes heat with electricity, 64% with utility gas[1] — the 5th-lowest electric share of the 15 Atlanta-area suburbs we cover; nearby, Johns Creek (23%), Alpharetta (37%), and Lawrenceville (44%) heat electrically. Gas heat means a furnace plus a separate AC condenser.
Gwinnett County forecast zone, 2016–2025: 0 heat or excessive-heat days and 10 winter-storm or hard-freeze days[4].
Storm exposure for HVAC hardware: 8 lightning-damage reports within 10 miles; 95 damaging-wind reports within 10 miles in 2016–2025[4]. Most recent: Nov 25, 2025, 6.6 miles from the city center.
70% of Duluth's 13,841 housing units were built before 2000 and 14% since 2010[1] (pre-2000 share nearby: Johns Creek (72%), Alpharetta (64%), and Lawrenceville (66%)). Older homes often keep original ductwork.
How air moves through a central system
How the loop runs: return duct to filter to air handler to supply ducts. A dirty filter slows everything downstream.
Duluth storm calendar
Within 10 miles of Duluth, 2016–2025: 95 damaging-wind reports and 8 lightning reports[4]. Peak: 61% in June, July, and August. Busiest year 2023 (21). Busiest month July 2017 (9). Latest: damaging-wind report, Nov 25, 2025, 6.6 mi out.
| Month | Damaging wind | Lightning | All |
|---|---|---|---|
| Jan | 7 | – | 7 |
| Feb | 9 | – | 9 |
| Mar | 5 | – | 5 |
| Apr | 7 | – | 7 |
| May | 3 | – | 3 |
| Jun | 22 | 2 | 24 |
| Jul | 19 | 6 | 25 |
| Aug | 14 | – | 14 |
| Oct | 1 | – | 1 |
| Nov | 3 | – | 3 |
| Dec | 5 | – | 5 |
HVAC help in Duluth: what to do next
Your request reaches AC & heating repair contractors who serve Duluth (ZIP codes 30096, 30097).
Before you call: repair or replace? what a good hvac visit covers
Duluth by the numbers
| Measure | Duluth | Median of 15 | Difference |
|---|---|---|---|
| Propane / LP heat | 0.9% | 1.2% | about the same |
| Built before 2000 | 70% | 66% | 4 pts higher |
| Electric heat | 34% | 37% | 2 pts lower |
| Utility-gas heat | 64% | 61% | 3 pts higher |
| Damaging-wind reports (10 mi) | 95 | 100 | 5 fewer |
| Built 2010 or later | 14% | 14% | 1 pts higher |
| Median year built | 1994 | 1994 | same as median |
Largest differences first. Medians are the middle value across the covered Atlanta-area suburbs, from the same sources.
| City | Lightning reports | Damaging-wind reports |
|---|---|---|
| Duluth | 8 | 95 |
| Johns Creek 3.7 mi | 7 | 92 |
| Alpharetta 8.5 mi | 3 | 83 |
| Lawrenceville 9.7 mi | 6 | 95 |
| Dunwoody 10.2 mi | 2 | 132 |
| Roswell 11.8 mi | 2 | 100 |
| Date | Wind | Distance |
|---|---|---|
| Nov 25, 2025 | 45 mph (est.) | 6.6 mi |
| Jul 18, 2025 | 60 mph (est.) | 6.5 mi |
| Jun 26, 2025 | 69 mph (est.) | 9.2 mi |
| Jun 17, 2025 | 60 mph (est.) | 6.4 mi |
| Jun 17, 2025 | 60 mph (est.) | 6.6 mi |
| Jun 7, 2025 | 64 mph (est.) | 9.5 mi |
| Date | Distance |
|---|---|
| Jul 16, 2018 | 8.1 mi |
| Jun 16, 2018 | 9.8 mi |
| Jul 14, 2017 | 8.3 mi |
| Jul 14, 2017 | 4.0 mi |
| Jul 13, 2017 | 7.3 mi |
| Jul 6, 2017 | 7.7 mi |
| Main heating fuel | Homes | Share | Margin of error |
|---|---|---|---|
| Utility gas | 8,434 | 63.9% | ±571 |
| Electricity | 4,541 | 34.4% | ±508 |
| Bottled or tank gas (propane, butane, etc.) | 124 | 0.9% | ±82 |
| No fuel used | 87 | 0.7% | ±85 |
| Fuel oil, kerosene, etc. | 17 | 0.1% | ±27 |
| Built | Units | Share | Margin of error |
|---|---|---|---|
| 2020 or later | 446 | 3.2% | ±160 |
| 2010 to 2019 | 1,517 | 11.0% | ±329 |
| 2000 to 2009 | 2,240 | 16.2% | ±399 |
| 1990 to 1999 | 4,571 | 33.0% | ±547 |
| 1980 to 1989 | 3,434 | 24.8% | ±407 |
| 1970 to 1979 | 968 | 7.0% | ±287 |
| 1960 to 1969 | 530 | 3.8% | ±260 |
| 1950 to 1959 | 135 | 1.0% | ±77 |
| 1940 to 1949 | 0 | 0.0% | ±30 |
| 1939 or earlier | 0 | 0.0% | ±30 |
ACS 2020–2024 estimates; margins of error are the Census Bureau's 90% intervals.
| Measure | Value |
|---|---|
| Housing units | 13,841 |
| Detached single-family | 6,498 (47%) |
| Occupied homes | 13,203 |
| Owner-occupied | 7,461 (57%) |
| Renter-occupied | 5,742 (43%) |
| Median home value | $400,800 |
ACS 2020–2024 estimates.
| ZIP (ZCTA) | Share of Duluth's land | Share of the ZIP inside the city |
|---|---|---|
| 30096 | 71% | 32% |
| 30097 | 26% | 11% |
Dated heat and freeze records for the GWINNETT forecast zone: see the county list.
HVAC questions from Duluth homeowners
Are heat pumps common in Duluth?
34% of Duluth homes heat with electricity[1], which means a heat pump or electric resistance heat.
How old are Duluth's homes — and their HVAC systems?
The median home dates to 1994, and 14% were built in 2010 or later[1]. Your own system may have been replaced since — the outdoor unit's data plate shows when it was made.
Which Duluth ZIP codes are covered?
30096 and 30097[5], Gwinnett County. Nearby pages: Johns Creek (3.7 mi), Alpharetta (8.5 mi), and Lawrenceville (9.7 mi)[3].
Sources
- Census ACS 2020–2024 5-year (keyless bulk)
- Census population estimates, Vintage 2025
- Census Gazetteer 2025
- NOAA Storm Events Database
- Census 2020 ZCTA–place file
Data pulled Sep 28, 2026. Full citations and method.