Furnace Repair in Lexington
Get fast, fair pricing from licensed local pros. Typical Lexington cost: $80 – $250 installed.
- Flame sensor
- $80 – $250
- Igniter
- $150 – $450
- Blower motor
- $400 – $1.5k
- Control board
- $300 – $800
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Furnace repair cost by part.
Typical Lexington repair pricing including parts and labor. A diagnostic fee usually applies and is often credited toward the work.
Furnace repair costs in Lexington, MA, typically range from $80 for a simple flame sensor replacement to $3,500+ for a heat exchanger, plus a $75–$200 diagnostic fee. With a median home built in 1963 and cold climate (Zone 5), many older systems require careful sizing and may benefit from dual-fuel setups. Massachusetts requires a mechanical permit for furnace work, and local labor rates reflect the area's high median income of $206,323. As of 2025, R-410A refrigerant is being phased out, so repairs on older units may involve transitioning to R-454B or R-32. The federal 25C tax credit offers up to $2,000 for qualifying heat pumps, but not for furnace-only repairs.
- Diagnostic / service callOften credited toward the repair$75 – $200
- Flame sensor or thermocoupleCommon no-heat cause on gas units$80 – $250
- Hot-surface igniterFurnace clicks but won’t light$150 – $450
- Blower motorNo airflow / weak airflow$400 – $1,500
- Heat exchangerCracked exchanger often means replace$1,500 – $3,500+
* 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 Lexington
U.S. Census ACS- Households
- 13,688
- Homeowners
- 10,239
- 81% own
- Median home value
- $1,085,000
- Median income
- $206,323
- Median home built
- 1963
- Housing units
- 12,727
With a median home built in 1963, many Lexington 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 Lexington.
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 Lexington
Given Massachusetts’s cold climate and mixed heating, dual-fuel (cold-climate heat pump + gas furnace) is the sensible default for most Lexington homes. A pro can confirm the right size and system for your home with a load calculation.
Sources: Mass Save Air Source Heat Pumps · EIA Massachusetts State Energy Profile
What Lexington code requires
Installing or replacing an HVAC system in Lexington follows Massachusetts 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—
Cold-climate (Climate Zone 5) sizing matters; Mass Save now requires cold-climate-rated heat pumps and excludes R-410A models from rebates as of Jan 1, 2026.
Sources: Mass Save Air Source Heat Pumps · EIA Massachusetts State Energy Profile
Not sure which rules and rebates apply to your home?
A licensed Lexington 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 Lexington
Massachusetts heating is mostly mixed, which shapes the money back:
- StateUp to $2,650/ton, capped at $8,500Mass Save Whole-Home 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.
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- 1
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- 2
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- 3
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Furnace Repair in Lexington, explained.
What Drives Furnace Repair Costs in Lexington?
Prices vary by the component needing repair—flame sensors and igniters are cheaper, while blower motors and control boards cost more. Labor rates are higher due to Lexington's affluent market, and permit fees add $50–$150. Older homes (median 1963) may have outdated ductwork or electrical systems, increasing labor time. Cold-climate sizing is critical; undersized repairs can lead to repeat failures. Choosing a dual-fuel system now can future-proof against refrigerant phaseouts.
Common Furnace Repairs in Lexington
Flame Sensor Failure
A dirty or faulty flame sensor causes the furnace to short-cycle. Typical repair cost: $80–$250.
Igniter Problems
A cracked or worn igniter prevents ignition. Replacement runs $150–$450, common in older Lexington homes.
Blower Motor Malfunction
A failing blower motor reduces airflow and efficiency. Repair cost: $400–$1,500, often needed in systems over 15 years old.
Furnace Repair FAQs — Lexington
Yes, Massachusetts requires a mechanical permit for most furnace repairs. Your contractor should pull the permit, which typically costs $50–$150 and ensures code compliance.
Furnace Repair near Lexington
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