Furnace Repair in St. Louis
Get fast, fair pricing from licensed local pros. Typical St. Louis cost: $85 – $250 installed.
- Flame sensor
- $85 – $250
- Igniter
- $150 – $475
- Blower motor
- $425 – $1.6k
- Control board
- $300 – $850
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Furnace repair cost by part.
Typical St. Louis repair pricing including parts and labor. A diagnostic fee usually applies and is often credited toward the work.
In St. Louis, furnace repair costs vary widely depending on the part and labor needed. With a median home age of 88 years, many homes have aging gas furnaces that require frequent repairs. Local pricing for common repairs includes flame sensor replacement ($85–$250), igniter replacement ($150–$475), blower motor replacement ($425–$1,550), control board replacement ($300–$850), and heat exchanger replacement ($1,550–$3,600+), plus a diagnostic fee of $80–$200. Missouri has no statewide mechanical code, so permit requirements are set locally—St. Louis City and County typically require permits for major repairs like heat exchanger or gas line work. The mixed-humid climate means furnaces run heavily in winter, making timely repairs essential. Most homes use gas heating, and a gas furnace paired with a central AC is the recommended system.
- Diagnostic / service callOften credited toward the repair$80 – $200
- Flame sensor or thermocoupleCommon no-heat cause on gas units$85 – $250
- Hot-surface igniterFurnace clicks but won’t light$150 – $475
- Blower motorNo airflow / weak airflow$425 – $1,550
- Heat exchangerCracked exchanger often means replace$1,550 – $3,600+
* 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 St. Louis
U.S. Census ACS- Households
- 119,207
- Homeowners
- 64,173
- 37% own
- Median home value
- $174,100
- Median income
- $52,941
- Median home built
- 1938
- Housing units
- 173,792
With a median home built in 1938, many St. Louis 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 St. Louis.
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 St. Louis
Given Missouri’s mixed-humid climate and gas heating, high-seer2 ac + gas furnace is the sensible default for most St. Louis 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 St. Louis code requires
Installing or replacing an HVAC system in St. Louis 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 St. Louis 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 St. Louis
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
Get matched with a local pro
We connect you with a licensed, insured HVAC technician near you — often the same day.
- 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 St. Louis, explained.
What Drives Furnace Repair Costs in St. Louis?
Repair costs in St. Louis depend on the part needed, labor time, and whether a permit is required. Older homes (median built 1938) may have outdated systems that are harder to service, increasing labor. The local median income of $52,941 means contractors price competitively, but specialized parts for older furnaces can be pricier. Permit fees, if required, add $50–$150. Seasonal demand also affects pricing—repairs in peak winter may cost more due to high call volume.
Common Furnace Repairs in St. Louis
Flame Sensor Failure
A dirty or faulty flame sensor causes the furnace to shut off after ignition. Common in older St. Louis homes due to dust and age.
Igniter Problems
A cracked or worn igniter prevents the furnace from lighting. Frequent in gas furnaces over 10 years old.
Blower Motor Malfunction
A failing blower motor reduces airflow or stops the fan. Often happens in older systems with worn bearings.
What to Expect During a Furnace Repair in St. Louis
A technician will first diagnose the issue, charging a fee of $80–$200. They will inspect the furnace, test components, and provide a repair quote. For major repairs like heat exchanger or gas line work, a mechanical permit may be required by St. Louis City or County. The job typically takes 1–4 hours, depending on the part. After repair, the technician will test the system to ensure safe operation.
Furnace Repair FAQs — St. Louis
It depends on the repair. Minor repairs like flame sensor or igniter replacement usually don't require a permit. However, major repairs such as heat exchanger or gas line work may require a mechanical permit from St. Louis City or County. Check with your contractor.
Furnace Repair near St. Louis
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