Furnace Repair in Affton
Get fast, fair pricing from licensed local pros. Typical Affton cost: $70 – $225 installed.
- Flame sensor
- $70 – $225
- Igniter
- $125 – $400
- Blower motor
- $350 – $1.3k
- Control board
- $250 – $700
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Furnace repair cost by part.
Typical Affton repair pricing including parts and labor. A diagnostic fee usually applies and is often credited toward the work.
Furnace repair costs in Affton, Missouri, typically range from $65–$175 for a diagnostic fee, plus parts and labor. With a median home age of 67 years, many homes have older furnaces that may need frequent repairs. Common repairs include flame sensors ($70–$225), igniters ($125–$400), and blower motors ($350–$1,300). Since Missouri has no statewide mechanical code, permit requirements are set locally by St. Louis County or Affton. Always confirm with your contractor whether a permit is needed for your repair. The mixed-humid climate and mostly gas heating mean furnace repairs are most common in winter, but moderate cooling demand also affects system wear.
- Diagnostic / service callOften credited toward the repair$65 – $175
- Flame sensor or thermocoupleCommon no-heat cause on gas units$70 – $225
- Hot-surface igniterFurnace clicks but won’t light$125 – $400
- Blower motorNo airflow / weak airflow$350 – $1,300
- Heat exchangerCracked exchanger often means replace$1,300 – $3,000+
* A cracked heat exchanger is a safety issue — on an older furnace, replacement is usually the call.
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
Tell us what’s wrong
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- 2
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- 3
Repair or replace, fast
Your pro confirms the price on-site and gets your comfort back. Most jobs done in a few hours.
Furnace Repair in Affton, explained.
What affects furnace repair costs in Affton?
Repair costs in Affton vary based on the part needed, labor rates, and whether a permit is required. Older homes (median built 1959) may have outdated systems that are harder to service or require specialized parts. Diagnostic fees ($65–$175) are standard. The lack of a statewide code means some repairs may need a local permit, adding to the cost. Energy efficiency upgrades, such as replacing an old heat exchanger ($1,300–$3,000+), can be more expensive but may qualify for federal tax credits.
Common furnace repairs in Affton
Flame sensor failure
A dirty or faulty flame sensor can cause the furnace to shut off after a few minutes. Cleaning or replacing it costs $70–$225.
Igniter problems
A broken igniter prevents the furnace from lighting. Replacement typically runs $125–$400.
Blower motor issues
A failing blower motor can reduce airflow or cause loud noises. Repair or replacement costs $350–$1,300.
Furnace Repair FAQs — Affton
Missouri has no statewide mechanical code, so permit requirements are set locally. In Affton (St. Louis County), a mechanical permit may be required for major repairs like heat exchanger replacement. Check with your contractor or the county building department.
Furnace Repair near Affton
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