AC & heating repair · Castle Rock, Colorado

AC repair and HVAC service in Castle Rock, CO

AC quit, heat pump struggling, or a system near the end of its life? In Castle Rock, 22% of homes heat with electricity^[1] and half were built before 2007. Request service from HVAC contractors working here. Castle Rock, in Douglas County — ZIPs 80104, 80109, 80108, counts 83,815 residents (2025 estimate)^[2].

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Castle Rock HVAC snapshot: the key figures

Population (2025 est.): 83,815^[2]+14.6% since 2020
County: Douglas^[2]
Land area: 34.7 sq mi^[3]
Population density: 2,412 / sq mi^[2]^[3]
Homes heated with electricity: 22%^[1]the 4th-lowest share of the 15 Denver-area suburbs we cover
Homes heated with utility gas: 76%^[1]plus 1% propane/LP
Lightning-damage reports within 10 mi: 1^[4]2016–2025; power surges damage HVAC control boards
Damaging-wind reports within 10 mi: 11^[4]2016–2025; wind-blown debris damages outdoor condenser units
Homes built before 2000: 29%^[1]of 29,159 housing units
Median year built: 2007^[1]the newest of the 15 Denver-area suburbs we cover

Reading the Castle Rock data for HVAC

Castle Rock is one of the fastest-growing Denver-metro suburbs tracked here: 83,815 people (2025 estimate), up 14.6% since 2020^[2]. The city spans 34.7 square miles at 2,412 residents per square mile (the 11th densest) and sits entirely in Douglas County, served by ZIP codes 80104, 80109, 80108^[3].

With 39% of homes built in 2010 or later^[1], a good share of Castle Rock's equipment may still be under builder or manufacturer warranty; the 29% built before 2000 is where replacement jobs cluster.

Mail to Castle Rock goes through 3 ZIP codes — 80104 (40% of the city's land), 80109 (37% of the city's land), 80108 (22% of the city's land)^[5].

Nearest of the other suburbs we track: Parker (9.9 mi NE), Centennial (14.8 mi N) and Littleton (17.3 mi NW)^[3].

22% of occupied Castle Rock homes heat with electricity, 76% with utility gas^[1] — the 4th-lowest electric share of the 15 Denver-area suburbs we cover; nearby, Parker (24%), Centennial (21%), and Littleton (29%) heat electrically. Gas heat means a furnace plus a separate AC condenser.

Storm exposure for HVAC hardware: 1 lightning-damage report within 10 miles; 11 damaging-wind reports within 10 miles in 2016–2025^[4]. Most recent: Jul 27, 2022, 7.2 miles from the city center.

29% of Castle Rock's 29,159 housing units were built before 2000 and 39% since 2010^[1] (pre-2000 share nearby: Parker (37%), Centennial (86%), and Littleton (79%)). Check builder-installed equipment for a registered warranty.

Measured against the 15 suburbs on this site, Castle Rock records the newest housing (by median year built) (2007)^[1], the highest share of homes built since 2010 (39%)^[1], the fewest damaging-wind reports nearby (11, tied with Golden)^[4], and the 3rd-highest gas-heat share (76%)^[1].

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. 1 lightning-damage report within 10 miles and 11 damaging-wind reports in 2016–2025.

Castle Rock storm calendar

Within 10 miles of Castle Rock, 2016–2025: 11 damaging-wind reports and 1 lightning report^[4]. Peak: 100% in May, June, and July. Busiest year 2020 (7); 5 of 10 years had none. Busiest month June 2020 (7). Latest: damaging-wind report, Jul 27, 2022, 7.2 mi out.

Castle Rock, 2016–2025
Month	Damaging wind	Lightning	All
May	–	1	1
Jun	7	–	7
Jul	4	–	4

Darker squares, more reports. NOAA Storm Events Database^[4].

Finding HVAC help around Castle Rock

Your request reaches AC & heating repair contractors who serve Castle Rock (ZIP codes 80104, 80109, 80108).

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Castle Rock by the numbers

How Castle Rock stacks up against the median suburb we cover (median of 15)^[1]^[4]
Measure	Castle Rock	Median of 15	Difference
Built 2010 or later	39%	15%	24 pts higher
Damaging-wind reports (10 mi)	11	31	20 fewer
Built before 2000	29%	71%	42 pts lower
Propane / LP heat	0.7%	0.9%	about the same
Electric heat	22%	26%	4 pts lower
Utility-gas heat	76%	71%	5 pts higher
Median year built	2007	1987	20 years newer

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

Castle Rock and nearby suburbs, side by side^[4]^[3]
City	Lightning reports	Damaging-wind reports
Castle Rock	1	11
Parker 9.9 mi	1	34
Centennial 14.8 mi	3	45
Littleton 17.3 mi	3	39
Englewood 20.2 mi	4	58
Aurora 24.1 mi	0	31

Most recent damaging-wind reports within 10 miles^[4]
Date	Wind	Distance
Jul 27, 2022	60 mph	7.2 mi
Jun 6, 2020	60 mph (est.)	1.0 mi
Jun 6, 2020	62 mph	7.9 mi
Jun 6, 2020	81 mph	7.9 mi
Jun 6, 2020	64 mph	2.5 mi
Jun 6, 2020	72 mph	2.8 mi

Lightning-damage reports within 10 miles^[4]
Date	Distance
May 7, 2017	7.3 mi

How Castle Rock's 28,219 occupied homes are heated^[1]
Main heating fuel	Homes	Share	Margin of error
Utility gas	21,532	76.3%	±765
Electricity	6,205	22.0%	±632
Solar energy	197	0.7%	±125
Bottled or tank gas (propane, butane, etc.)	191	0.7%	±138
Fuel oil, kerosene, etc.	33	0.1%	±41
Other fuel	33	0.1%	±49
No fuel used	28	0.1%	±35

When Castle Rock's 29,159 housing units were built^[1]
Built	Units	Share	Margin of error
2020 or later	2,412	8.3%	±296
2010 to 2019	8,989	30.8%	±688
2000 to 2009	9,352	32.1%	±693
1990 to 1999	4,645	15.9%	±615
1980 to 1989	1,637	5.6%	±327
1970 to 1979	1,449	5.0%	±354
1960 to 1969	278	1.0%	±110
1950 to 1959	249	0.9%	±144
1940 to 1949	72	0.2%	±71
1939 or earlier	76	0.3%	±61

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

Castle Rock housing and households^[1]
Measure	Value
Housing units	29,159
Detached single-family	21,495 (74%)
Occupied homes	28,219
Owner-occupied	22,227 (79%)
Renter-occupied	5,992 (21%)
Median home value	$652,900

ACS 2020–2024 estimates.

ZIP code areas covering Castle Rock^[5]
ZIP (ZCTA)	Share of Castle Rock's land	Share of the ZIP inside the city
80104	40%	19%
80109	37%	49%
80108	22%	22%

Common Castle Rock HVAC questions

Are heat pumps common in Castle Rock?

22% of Castle Rock homes heat with electricity^[1], which means a heat pump or electric resistance heat.

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

The median home dates to 2007, and 39% 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 Castle Rock ZIP codes are covered?

80104, 80109, and 80108^[5], Douglas County. Nearby pages: Parker (9.9 mi), Centennial (14.8 mi), and Littleton (17.3 mi)^[3].

My Castle Rock home is fairly new — could the HVAC equipment still be under warranty?

Possibly: 39% of Castle Rock's housing units were built in 2010 or later^[1], the highest share of the 15 Denver-area suburbs we cover. Check your closing paperwork for warranties before paying for a repair.

Sources

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