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AC & heating repair · Wentzville, Missouri

AC repair and HVAC service in Wentzville, MO

AC quit, heat pump struggling, or a system near the end of its life? In Wentzville, 34% of homes heat with electricity[1] and half were built before 2008. Request service from HVAC contractors working here. Wentzville, in St. Charles County — ZIP 63385, counts 49,495 residents (2025 estimate)[2].

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Wentzville HVAC snapshot: the key figures

Population (2025 est.)
49,495[2]+10.1% since 2020
County
St. Charles[2]
Land area
22.0 sq mi[3]
Population density
2,248 / sq mi[2][3]
Homes heated with electricity
34%[1]the 4th-highest share of the 15 St. Louis–area suburbs we cover
Homes heated with utility gas
63%[1]plus 2% propane/LP
Heat & excessive-heat days, st. charles zone
14[4]2016–2025
Winter-storm & freeze days, st. charles zone
12[4]2016–2025; heating demand and freeze-related furnace failures
Lightning-damage reports within 10 mi
0[4]2016–2025; power surges damage HVAC control boards
Damaging-wind reports within 10 mi
40[4]2016–2025; wind-blown debris damages outdoor condenser units
Homes built before 2000
19%[1]of 16,601 housing units
Median year built
2008[1]the newest of the 15 St. Louis–area suburbs we cover

What Wentzville's numbers say about HVAC

Wentzville is one of the fastest-growing St. Louis–metro suburbs tracked here: 49,495 people (2025 estimate), up 10.1% since 2020[2]. On the map that's 22.0 square miles holding 2,248 residents per square mile, the 9th densest of the suburbs here; it sits entirely in St. Charles County, with ZIP code 63385[3].

With 40% of homes built in 2010 or later[1], a good share of Wentzville's equipment may still be under builder or manufacturer warranty; the 19% built before 2000 is where replacement jobs cluster.

The entire city sits in ZIP code 63385[5].

The tracked suburbs closest by are Lake St. Louis (5.2 mi SE), O'Fallon (8.4 mi E) and St. Peters (14.6 mi E)[3].

34% of occupied Wentzville homes heat with electricity, 63% with utility gas and 2% with propane[1] — the 4th-highest electric share of the 15 St. Louis–area suburbs we cover; nearby, Lake St. Louis (35%), O'Fallon (27%), and St. Peters (29%) heat electrically. Gas heat means a furnace plus a separate AC condenser.

St. Charles County forecast zone, 2016–2025: 14 heat or excessive-heat days (latest Aug 15, 2025) and 12 winter-storm or hard-freeze days[4].

Storm exposure for HVAC hardware: 0 lightning-damage reports within 10 miles; 40 damaging-wind reports within 10 miles in 2016–2025[4]. Most recent: May 16, 2025, 8.5 miles from the city center.

19% of Wentzville's 16,601 housing units were built before 2000 and 40% since 2010[1] (pre-2000 share nearby: Lake St. Louis (50%), O'Fallon (50%), and St. Peters (75%)). Check builder-installed equipment for a registered warranty.

Measured against the 15 suburbs on this site, Wentzville records the newest housing (by median year built) (2008)[1], the highest share of homes built since 2010 (40%)[1], the 2nd-fewest damaging-wind reports nearby (40)[4], and the 3rd-lowest gas-heat share (63%)[1].

How air moves through a central system

Return, filter, air handler, supply ducts: a clogged filter slows the whole loop.

Illustration, not to scale. The local workload: 14 heat or excessive-heat days and 12 winter-storm or freeze days in 2016–2025 — filters, coils and capacitors age faster under long cooling seasons. 0 lightning-damage reports within 10 miles and 40 damaging-wind reports over the same span.

Wentzville storm calendar

Within 10 miles of Wentzville, 2016–2025: 40 damaging-wind reports[4]. Peak: 63% in May, June, and July. Busiest year 2019 (7). Busiest month June 2019 (4). Latest: damaging-wind report, May 16, 2025, 8.5 mi out.

JFMAMJJASOND2016201720182019202020212022202320242025Apr 2016: 2May 2016: 1Jul 2016: 3Mar 2017: 1May 2017: 1Jul 2017: 1Sep 2017: 1May 2018: 1Oct 2018: 1Mar 2019: 1Jun 2019: 4Aug 2019: 2Jun 2020: 1Jul 2020: 1Aug 2020: 1May 2021: 1Jun 2021: 2Jul 2021: 1Aug 2021: 2Mar 2022: 2May 2022: 1Jun 2022: 1Feb 2023: 1May 2023: 1Jul 2023: 2Aug 2023: 1May 2024: 1Jun 2024: 1May 2025: 1
Wentzville, 2016–2025
MonthDamaging windLightningAll
Feb1–1
Mar4–4
Apr2–2
May8–8
Jun9–9
Jul8–8
Aug6–6
Sep1–1
Oct1–1
Darker squares, more reports. NOAA Storm Events Database[4].

HVAC help in Wentzville: what to do next

AC & heating repair contractors taking requests around Wentzville cover ZIP code 63385.

[PLACEHOLDER consent text — pending legal review and the lead buyer's terms]

PLACEHOLDER lead buyer and partner links — nothing here is live.

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

The data underneath this Wentzville page

How Wentzville stacks up against the median suburb we cover (median of 15)[1][4]
MeasureWentzvilleMedian of 15Difference
Built 2010 or later40%6%34 pts higher
Built before 200019%83%65 pts lower
Damaging-wind reports (10 mi)407232 fewer
Electric heat34%29%5 pts higher
Propane / LP heat1.6%1.4%about the same
Utility-gas heat63%69%5 pts lower
Median year built2008197731 years newer

Largest differences first. Medians are the middle value across the covered St. Louis–area suburbs, from the same sources.

Wentzville and nearby suburbs, side by side[4][3]
CityHeat daysLightning reportsDamaging-wind reports
Wentzville14040
Lake St. Louis 5.2 mi14049
O'Fallon 8.4 mi14066
St. Peters 14.6 mi14075
St. Charles 19.2 mi14068
Chesterfield 19.3 mi21184
Most recent damaging-wind reports within 10 miles[4]
DateWindDistance
May 16, 202564 mph (est.)8.5 mi
Jun 25, 202469 mph (est.)7.0 mi
May 21, 202475 mph (est.)5.7 mi
Aug 12, 202360 mph (est.)2.0 mi
Jul 29, 202360 mph8.1 mi
Jul 16, 202360 mph (est.)2.0 mi
How Wentzville's 16,294 occupied homes are heated[1]
Main heating fuelHomesShareMargin of error
Utility gas10,33963.5%±590
Electricity5,60834.4%±517
Bottled or tank gas (propane, butane, etc.)2611.6%±104
Wood460.3%±41
Other fuel180.1%±29
Fuel oil, kerosene, etc.120.1%±18
No fuel used100.1%±15
When Wentzville's 16,601 housing units were built[1]
BuiltUnitsShareMargin of error
2020 or later6083.7%±180
2010 to 20196,02336.3%±545
2000 to 20096,85541.3%±634
1990 to 19991,0626.4%±211
1980 to 19894172.5%±135
1970 to 19793502.1%±131
1960 to 19693412.1%±163
1950 to 19597344.4%±351
1940 to 19491070.6%±70
1939 or earlier1040.6%±67

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

Wentzville housing and households[1]
MeasureValue
Housing units16,601
Detached single-family13,664 (82%)
Occupied homes16,294
Owner-occupied13,442 (82%)
Renter-occupied2,852 (18%)
Median home value$331,300

ACS 2020–2024 estimates.

ZIP code areas covering Wentzville[5]
ZIP (ZCTA)Share of Wentzville's landShare of the ZIP inside the city
6338587%26%

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

Wentzville HVAC questions

Are heat pumps common in Wentzville?

34% of Wentzville homes heat with electricity[1], which means a heat pump or electric resistance heat.

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

The median home dates to 2008, and 40% 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 Wentzville ZIP codes are covered?

63385[5], St. Charles County. Nearby pages: Lake St. Louis (5.2 mi), O'Fallon (8.4 mi), and St. Peters (14.6 mi)[3].

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

Possibly: 40% of Wentzville's housing units were built in 2010 or later[1], the highest share of the 15 St. Louis–area suburbs we cover. Check your closing paperwork for warranties before paying for a repair.

Sources

  1. Census ACS 2020–2024 5-year (keyless bulk)
  2. Census population estimates, Vintage 2025
  3. Census Gazetteer 2025
  4. NOAA Storm Events Database
  5. Census 2020 ZCTA–place file

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