AC Installation in Affton
Get fast, fair pricing from licensed local pros. Typical Affton cost: $3.5k – $7k+ installed.
- Central AC (replace)
- $3.5k – $7k+
- New central AC + ducts
- $5.2k – $11.5k+
- Ductless mini-split
- $2.6k – $7k
- Permit & inspection
- $65 – $350
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AC installation cost by system.
Installed pricing for Affton, adjusted for local labor. Higher SEER2 tiers, larger tonnage, and new ductwork add to the base.
In Affton, Missouri, AC installation costs typically range from $3,500 to $7,000 for a like-for-like central AC replacement, and $5,200 to $11,300+ if new ductwork is needed. Ductless mini-splits run $2,600–$7,000, and heat pumps $4,300–$10,400+. With a median home age of 67 years, many homes have older ductwork that may require upgrades. Affton's mixed-humid climate means moderate cooling demand, and most homes use gas heating, making an AC-gas furnace combination a recommended system. Local permits are required—Missouri leaves code enforcement to local jurisdictions, so check with St. Louis County. Federal 25C tax credits (30%, up to $2,000 for heat pumps, $600 for high-efficiency AC) can offset costs.
- Central AC, like-for-likeExisting ducts in good shape$3,500 – $7,000+
- New central AC + ductworkFirst-time or full duct replacement$5,200 – $11,500+
- Ductless mini-splitSingle or multi-zone, no ducts$2,600 – $7,000
- Heat pump (cooling + heating)Qualifies for federal & local rebates$4,300 – $10,500+
- Permit & inspectionRequired in most jurisdictions$65 – $350
* High-efficiency systems cost more upfront but may qualify for federal tax credits and utility rebates.
Pricing reviewed · Local data from U.S. Census ACS
HVAC systems in Affton
U.S. Census ACS- Households
- 7,969
- Homeowners
- 6,899
- 74% own
- Median home value
- $185,400
- Median income
- $75,237
- Median home built
- 1959
- Housing units
- 9,300
With a median home built in 1959, many Affton AC and furnace systems are at or past their 12–15 year lifespan — a common reason replacements spike here.
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What’s different about Affton.
Generic cost pages skip the things that actually decide your price and which system fits here — local code, climate, and the money you can claim back.
Recommended unit for Affton
Given Missouri’s mixed-humid climate and gas heating, high-seer2 ac + gas furnace is the sensible default for most Affton homes. A pro can confirm the right size and system for your home with a load calculation.
Sources: Ameren Missouri Heating and Cooling / HVAC rebates · SEER2 North Region efficiency standards
What Affton code requires
Installing or replacing an HVAC system in Affton follows Missouri rules under the state mechanical code. Here’s what applies statewide:
- PermitRequired
Mechanical permit pulled by your licensed HVAC contractor; covers equipment, refrigerant, and the electrical disconnect.
- SEER2 minimum13.4 SEER2 (North)
Federal North-region minimum for new split-system AC. Higher tiers cut bills and unlock rebates.
- Load calculationRecommended
Sizing by load calc — not rule of thumb — prevents an oversized unit that short-cycles and never dehumidifies.
- RefrigerantR-454B / R-32 (R-410A phased down 2025+)
- Good to know—
Missouri has no statewide residential building/mechanical code, so permit and inspection requirements are set locally by each city or county.
Sources: Ameren Missouri Heating and Cooling / HVAC rebates · SEER2 North Region efficiency standards
Not sure which rules and rebates apply to your home?
A licensed Affton pro will walk you through code, the right unit, and what you can claim back — in one quick call.
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Money back in Affton
Missouri heating is mostly gas, which shapes the money back:
- StateUp to $2,000 per qualifying air-source heat pump (up to $1,000 central AC, up to $500/ton mini-split)Ameren Missouri PAYS (Pay As You Save) air-source heat pump rebate →
State or utility program — verify eligibility before you buy.
- Federal30% of cost, up to $2,000Federal 25C tax credit — heat pump →
For a qualifying ENERGY STAR heat pump meeting the CEE efficiency tier. Claimed on your federal return.
- Federal30% of cost, up to $600Federal 25C tax credit — central AC →
For a qualifying high-efficiency central air conditioner.
The federal 25C tax credit (30%, up to $2,000 for a qualifying heat pump and up to $600 for a high-efficiency central AC) applies in every state, including Missouri.
Comfort back in three steps.
- 1
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- 2
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- 3
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Your pro confirms the price on-site and gets your comfort back. Most jobs done in a few hours.
AC Installation in Affton, explained.
What Drives AC Installation Costs in Affton?
Key factors include system type and efficiency (SEER2 rating), with higher SEER2 units qualifying for federal tax credits. Older homes (median built 1959) often need ductwork modifications or replacement, adding $1,700–$6,000+. Labor rates reflect local market conditions, and permit fees vary by jurisdiction. The shift to R-454B or R-32 refrigerant (R-410A phased down after 2025) may affect equipment pricing. Heat pumps can cost more upfront but offer year-round efficiency.
Common AC Installation Issues in Affton
Aging Ductwork
Many Affton homes have original or poorly sealed ducts that leak air, reducing efficiency and requiring repair or replacement.
Permit and Code Compliance
Missouri lacks a statewide code, so local permit requirements vary—installers must verify with St. Louis County to avoid fines.
Refrigerant Transition
With R-410A phasedown starting 2025, new systems use R-454B or R-32, which may require different handling and equipment.
AC Installation FAQs — Affton
Yes, a mechanical permit is required. Since Missouri has no statewide code, check with St. Louis County or the city of Affton for specific requirements.
AC Installation near Affton
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