AC & heating repair · Round Rock, Texas

AC repair and HVAC service in Round Rock, TX

AC quit, heat pump struggling, or a system near the end of its life? In Round Rock, 47% of homes heat with electricity^[1] and half were built before 2002. Request service from HVAC contractors working here. Round Rock, in Williamson County and Travis County — ZIPs 78665, 78664, 78681, counts 141,282 residents (2025 estimate)^[2].

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The Round Rock HVAC picture in brief

Population (2025 est.): 141,282^[2]+18.2% since 2020
County: Williamson / Travis^[2]city spans more than one county
Land area: 38.6 sq mi^[3]
Population density: 3,659 / sq mi^[2]^[3]
Homes heated with electricity: 47%^[1]the 4th-lowest share of the 15 Austin-area suburbs we cover
Homes heated with utility gas: 50%^[1]plus 1% propane/LP
Heat & excessive-heat days, williamson zone: 5^[4]2016–2025
Winter-storm & freeze days, williamson zone: 23^[4]2016–2025; heating demand and freeze-related furnace failures
Lightning-damage reports within 10 mi: 4^[4]2016–2025; power surges damage HVAC control boards
Damaging-wind reports within 10 mi: 41^[4]2016–2025; wind-blown debris damages outdoor condenser units
Homes built before 2000: 45%^[1]of 51,143 housing units
Median year built: 2002^[1]the 2nd-oldest of the 15 Austin-area suburbs we cover

What the local data means for HVAC in Round Rock

Round Rock counts 141,282 residents (2025 estimate), growing at a middle-of-the-pack 18.2% since 2020^[2]. The city spans 38.6 square miles at 3,659 residents per square mile (the 1st densest) and spans Williamson County and Travis County, served by ZIP codes 78665, 78664, 78681^[3].

With 28% of homes built in 2010 or later^[1], a good share of Round Rock's equipment may still be under builder or manufacturer warranty; the 45% built before 2000 is where replacement jobs cluster.

3 ZIP codes cover Round Rock — 78665 (39% of the city's land), 78664 (32% of the city's land), 78681 (28% of the city's land)^[5].

Nearest of the other suburbs we track: Pflugerville (6.5 mi SE), Hutto (7.2 mi E) and Cedar Park (9.3 mi W)^[3].

47% of occupied Round Rock homes heat with electricity, 50% with utility gas and 1% with propane^[1] — the 4th-lowest electric share of the 15 Austin-area suburbs we cover; nearby, Pflugerville (47%), Hutto (60%), and Cedar Park (43%) heat electrically. Gas heat means a furnace plus a separate AC condenser.

Williamson County forecast zone, 2016–2025: 5 heat or excessive-heat days (latest Aug 20, 2024) and 23 winter-storm or hard-freeze days^[4]. Nearby: Pflugerville (8), Hutto (5), and Cedar Park (5).

Storm exposure for HVAC hardware: 4 lightning-damage reports within 10 miles; 41 damaging-wind reports within 10 miles in 2016–2025^[4]. Most recent: May 28, 2025, 9.8 miles from the city center.

45% of Round Rock's 51,143 housing units were built before 2000 and 28% since 2010^[1] (pre-2000 share nearby: Pflugerville (38%), Hutto (6%), and Cedar Park (34%)). Check builder-installed equipment for a registered warranty.

Measured against the 15 suburbs on this site, Round Rock records the lowest share of homes built since 2010 (28%)^[1], the 2nd-oldest housing (by median year built) (2002)^[1], and the 2nd-most damaging-wind reports nearby (41)^[4].

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.

Illustration, not to scale. The local workload: 5 heat or excessive-heat days and 23 winter-storm or freeze days in 2016–2025 — filters, coils and capacitors age faster under long cooling seasons. 4 lightning-damage reports within 10 miles and 41 damaging-wind reports over the same span.

HVAC help in Round Rock: what to do next

Requests go to AC & heating repair contractors serving the Round Rock area — ZIP codes 78665, 78664, 78681.

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Before you pick up the phone: repair or replace? what a good hvac visit covers

Round Rock by the numbers

How Round Rock stacks up against the median suburb we cover (median of 15)^[1]^[4]
Measure	Round Rock	Median of 15	Difference
Built before 2000	45%	17%	28 pts higher
Damaging-wind reports (10 mi)	41	24	17 more
Propane / LP heat	1.1%	2.2%	1 pts lower
Built 2010 or later	28%	50%	22 pts lower
Utility-gas heat	50%	37%	13 pts higher
Electric heat	47%	60%	12 pts lower
Median year built	2002	2010	8 years older

Sorted by largest difference. Each median is the middle value across the covered Austin-area suburbs, from the same sources.

Round Rock and nearby suburbs, side by side^[4]^[3]
City	Heat days	Freeze days	Lightning reports	Damaging-wind reports
Round Rock	5	23	4	41
Pflugerville 6.5 mi	8	22	1	40
Hutto 7.2 mi	5	23	0	21
Cedar Park 9.3 mi	5	23	7	45
Georgetown 10.0 mi	5	23	1	14
Leander 12.3 mi	5	23	6	25

Most recent damaging-wind reports within 10 miles^[4]
Date	Wind	Distance
May 28, 2025	75 mph (est.)	9.8 mi
May 16, 2024	70 mph (est.)	7.4 mi
May 16, 2024	70 mph (est.)	9.7 mi
Sep 24, 2023	64 mph (est.)	9.7 mi
Sep 24, 2023	70 mph (est.)	3.0 mi
May 5, 2023	60 mph (est.)	4.4 mi

Lightning-damage reports within 10 miles^[4]
Date	Distance
Jul 24, 2017	7.5 mi
Jul 24, 2017	7.4 mi
Jul 23, 2017	8.1 mi
May 9, 2017	6.3 mi

How Round Rock's 48,647 occupied homes are heated^[1]
Main heating fuel	Homes	Share	Margin of error
Utility gas	24,423	50.2%	±1,236
Electricity	22,992	47.3%	±1,016
Bottled or tank gas (propane, butane, etc.)	547	1.1%	±231
No fuel used	354	0.7%	±227
Solar energy	202	0.4%	±110
Fuel oil, kerosene, etc.	74	0.2%	±79
Wood	40	0.1%	±59
Other fuel	15	0.0%	±25

When Round Rock's 51,143 housing units were built^[1]
Built	Units	Share	Margin of error
2020 or later	2,832	5.5%	±546
2010 to 2019	11,556	22.6%	±807
2000 to 2009	13,813	27.0%	±918
1990 to 1999	10,415	20.4%	±973
1980 to 1989	7,141	14.0%	±961
1970 to 1979	3,916	7.7%	±459
1960 to 1969	691	1.4%	±225
1950 to 1959	424	0.8%	±199
1940 to 1949	248	0.5%	±139
1939 or earlier	107	0.2%	±61

ACS 2020–2024 estimates; margins of error are the Census Bureau's 90% intervals.

Round Rock housing and households^[1]
Measure	Value
Housing units	51,143
Detached single-family	32,923 (64%)
Occupied homes	48,647
Owner-occupied	27,016 (56%)
Renter-occupied	21,631 (44%)
Median home value	$418,600

ACS 2020–2024 estimates.

ZIP code areas covering Round Rock^[5]
ZIP (ZCTA)	Share of Round Rock's land	Share of the ZIP inside the city
78665	39%	61%
78664	32%	72%
78681	28%	45%

Dated heat and freeze records for the WILLIAMSON forecast zone: see the county list.

HVAC questions from Round Rock homeowners

Are heat pumps common in Round Rock?

47% of Round Rock homes heat with electricity^[1], which means a heat pump or electric resistance heat.

How old are Round Rock's homes — and their HVAC systems?

The median home dates to 2002, and 28% 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 Round Rock ZIP codes are covered?

78665, 78664, and 78681^[5], Williamson County. Nearby pages: Pflugerville (6.5 mi), Hutto (7.2 mi), and Cedar Park (9.3 mi)^[3].

A lot of Round Rock homes predate 1980 — what does that mean for HVAC equipment work?

11% of Round Rock's housing units were built before 1980, 1.5% before 1960^[1] — the 4th-highest share of the 15 Austin-area suburbs we cover. The ductwork in an older house is often original even when the equipment is not — ask for a duct leakage check with any replacement quote.

I rent in Round Rock. Who arranges the repair?

44% of occupied Round Rock homes are rented^[1], the 4th-highest share of the 15 Austin-area suburbs we cover. Tell your landlord or property manager in writing first; your lease says who arranges repairs.

Sources

Data pulled Sep 28, 2026. Full citations and method.