Furnace Repair in Lemay
Get fast, fair pricing from licensed local pros. Typical Lemay cost: $65 – $200 installed.
- Flame sensor
- $65 – $200
- Igniter
- $125 – $350
- Blower motor
- $325 – $1.2k
- Control board
- $250 – $650
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Furnace repair cost by part.
Typical Lemay repair pricing including parts and labor. A diagnostic fee usually applies and is often credited toward the work.
Furnace repair costs in Lemay, Missouri, typically range from $65 for a simple flame sensor replacement to over $2,800 for a heat exchanger. With a median home age of 71 years, older systems often require more frequent repairs. Labor rates reflect local conditions, and a diagnostic fee of $60–$150 is standard. Missouri does not enforce a statewide mechanical code, so permit requirements are set by St. Louis County or the city of Lemay. Most homes use gas furnaces, and the mixed-humid climate means moderate cooling demand. For system replacements, a gas furnace paired with an AC is common. Federal tax credits (25C) are available for qualifying high-efficiency equipment.
- Diagnostic / service callOften credited toward the repair$60 – $150
- Flame sensor or thermocoupleCommon no-heat cause on gas units$65 – $200
- Hot-surface igniterFurnace clicks but won’t light$125 – $350
- Blower motorNo airflow / weak airflow$325 – $1,200
- Heat exchangerCracked exchanger often means replace$1,200 – $2,800+
* 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 Lemay
U.S. Census ACS- Households
- 6,484
- Homeowners
- 4,898
- 69% own
- Median home value
- $135,300
- Median income
- $56,591
- Median home built
- 1955
- Housing units
- 7,144
With a median home built in 1955, many Lemay 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 Lemay.
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 Lemay
Given Missouri’s mixed-humid climate and gas heating, high-seer2 ac + gas furnace is the sensible default for most Lemay 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 Lemay code requires
Installing or replacing an HVAC system in Lemay 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 Lemay 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 Lemay
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 Lemay, explained.
Why furnace repair costs vary in Lemay
Repair costs depend on the part needed, labor time, and whether a permit is required. Older homes (median built 1955) may have outdated ductwork or electrical systems that complicate repairs. The specific issue—such as a flame sensor ($65–$200) versus a blower motor ($325–$1,200)—drives the price. Seasonal demand can affect availability, and some repairs may require a load calculation to ensure proper sizing. Since Missouri has no statewide code, local permit fees (if any) add to the total.
Common furnace repairs in Lemay
Flame sensor failure
A dirty or faulty flame sensor is a frequent issue in older furnaces, causing the burner to shut off after a few seconds. Cleaning or replacement costs $65–$200.
Igniter problems
A worn-out igniter prevents the furnace from lighting. Replacement typically runs $125–$350, common in units over 10 years old.
Blower motor malfunction
A failing blower motor reduces airflow and efficiency. Repair or replacement costs $325–$1,200, often needed in Lemay's older homes with aging systems.
Furnace Repair FAQs — Lemay
Permit requirements vary by jurisdiction. In Lemay, St. Louis County or the city may require a mechanical permit for major repairs like heat exchanger replacement. Check with the local building department before starting work.
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