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Lennox

OEM Lennox Heat Exchanger Assembly — 71L27

SKU: LNX-71L27 Brand: Lennox
$399.95 $549.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The OEM Lennox 71L27 heat exchanger assembly is the heart of your Lennox gas furnace's heating cycle. It draws heat from the combustion chamber and passes it to the blower-driven air stream, all while containing flue gases and directing them safely to the vent. Built to Lennox factory tolerances, the 71L27 delivers the correct heat transfer surface area and airflow path your furnace was designed around.

Common failure symptoms: Watch for hairline cracks, rust or scaling on the exchanger surface, a distorted or lifting burner flame, soot deposits, and rumbling or booming sounds during ignition. Repeated high-limit trips, short cycling, or a triggered CO detector are strong signs the exchanger has failed and needs replacement.

Why OEM matters: Because the heat exchanger separates combustion byproducts from your indoor air, precision and durability are non-negotiable. The genuine Lennox 71L27 is manufactured with the exact alloy, gauge, and welds that meet Lennox safety and efficiency standards and keep your warranty intact. Installation should always be handled by a qualified HVAC professional.

Shipping Information

  • Orders placed before 3PM CST ship same business day
  • Standard delivery: 2-5 business days
  • Express shipping available at checkout
  • Free shipping on orders over $75
  • Tracking number emailed upon shipment

Return Policy

  • 30-day returns on unused parts in original packaging
  • Electrical parts (capacitors, contactors, control boards) are final sale once installed
  • Email info@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Heat Exchanger fit my Lennox OEM Lennox Heat Exchanger Assembly — 71L27?
Yes. This is the factory-specified OEM heat exchanger for the Lennox OEM Lennox Heat Exchanger Assembly — 71L27. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.
How do I replace the heat exchanger on my Lennox OEM Lennox Heat Exchanger Assembly — 71L27?
Refer to your equipment service manual for model-specific steps. General approach: turn off power, photograph connections, remove old part, install new part, restore power and test. For gas components, hire a licensed technician. Email info@nationalhvacparts.com for guidance.
What symptoms mean I need a new heat exchanger?
Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.
Is this heat exchanger compatible with Bryant or Payne too?
Many Lennox parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.
Should I use OEM or aftermarket for my Lennox heat exchanger?
OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.
How fast does National HVAC Parts ship?
Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.
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Mike Rivera
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