AC Installation in Farmington
Get fast, fair pricing from licensed local pros. Typical Farmington cost: $3.1k – $6.2k+ installed.
- Central AC (replace)
- $3.1k – $6.2k+
- New central AC + ducts
- $4.6k – $10k+
- Ductless mini-split
- $2.3k – $6.2k
- Permit & inspection
- $60 – $300
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AC installation cost by system.
Installed pricing for Farmington, adjusted for local labor. Higher SEER2 tiers, larger tonnage, and new ductwork add to the base.
In Farmington, Missouri, the cost of AC installation typically ranges from $3,100 to $6,200 for a like-for-like central AC replacement, and from $4,600 to $10,100 if new ductwork is needed. Ductless mini-splits run $2,300–$6,200, while heat pumps range $3,900–$9,300+. Because Farmington is a smaller market (tier 4) with a median home age of 43 years, many homes may need ductwork modifications or upgrades to meet current efficiency standards. The local climate is mixed-humid with moderate cooling demand, so a central AC paired with a gas furnace is a common and cost-effective choice. Missouri has no statewide mechanical code, so permit requirements are set locally—always check with the city of Farmington before starting work.
- Central AC, like-for-likeExisting ducts in good shape$3,100 – $6,200+
- New central AC + ductworkFirst-time or full duct replacement$4,600 – $10,000+
- Ductless mini-splitSingle or multi-zone, no ducts$2,300 – $6,200
- Heat pump (cooling + heating)Qualifies for federal & local rebates$3,900 – $9,300+
- Permit & inspectionRequired in most jurisdictions$60 – $300
* 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 Farmington
U.S. Census ACS- Households
- 7,144
- Homeowners
- 3,313
- 48% own
- Median home value
- $168,400
- Median income
- $49,317
- Median home built
- 1983
- Housing units
- 6,972
With a median home built in 1983, many Farmington 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 Farmington.
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 Farmington
Given Missouri’s mixed-humid climate and gas heating, high-seer2 ac + gas furnace is the sensible default for most Farmington 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 Farmington code requires
Installing or replacing an HVAC system in Farmington 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 Farmington 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 Farmington
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 Farmington, explained.
What affects AC installation cost in Farmington?
System type is the biggest factor: a heat pump costs more upfront than a central AC but may qualify for federal tax credits. Ductwork condition matters—homes built around 1983 may need repairs or new ducts, adding $1,500–$4,000+. Equipment efficiency also plays a role; higher SEER2 units cost more but can lower utility bills. Finally, local permit fees and labor rates in Farmington are modest compared to metro areas, keeping prices on the lower end of the ranges.
Common AC installation issues in Farmington
Aging ductwork
Many homes built in the 1980s have undersized or leaky ducts that need replacement or sealing, adding significant cost.
Local permit compliance
Farmington requires a mechanical permit; failing to pull one can result in fines or issues when selling the home.
Refrigerant transition
R-410A is being phased out; new systems use R-454B or R-32, which may affect service compatibility and cost.
AC Installation FAQs — Farmington
Yes, a mechanical permit is required. Contact the city of Farmington for specific fees and inspection requirements.
AC Installation near Farmington
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