Lennox homeowners commonly need help locating a dealer, checking warranty coverage, registering new HVAC equipment, disputing an installation, obtaining a covered replacement part, troubleshooting an iComfort thermostat, or escalating a repair that remains unresolved. For Lennox residential homeowner support, call 1-800-953-6669.

Safety warning: Leave the building and contact the gas utility or emergency services from a safe location if you smell gas. Do not operate electrical switches, thermostats, telephones, appliances or flames inside the building. If a carbon-monoxide alarm sounds or anyone has symptoms of possible exposure, move everyone to fresh air and contact emergency services.

How to Contact Lennox Customer Service

Residential homeowner support: 1-800-953-6669
Residential support hours: Monday–Friday, 8:00 a.m.–6:00 p.m. Central Time
Residential support, chat and contact form: Contact Lennox Residential Support

Find a Lennox dealer: Lennox Dealer Locator
Warranty lookup: Check Lennox Warranty Coverage
Product registration: Register Lennox Equipment
Manuals and product literature: Lennox Product Literature
Residential consumer-support mailing address: Lennox Consumer Support, P.O. Box 799900, Dallas, TX 75379
Commercial HVAC support: 1-800-453-6669
Commercial support hours: Monday–Friday, 7:00 a.m.–5:00 p.m. Central Time
Commercial National Accounts: 1-800-367-6285
Corporate headquarters: Lennox International Inc., 2140 Lake Park Boulevard, Richardson, TX 75080
Corporate headquarters phone: 1-972-497-5000
Official website: Lennox.com

Lennox’s residential contact form asks for the model number, serial number, installation date, installing dealer and servicing dealer. Lennox says a representative should respond within approximately three business days. Contact a local dealer when immediate heating, cooling or equipment service is required.

The Richardson corporate office is not a walk-in repair location, residential service company, parts counter or destination for equipment shipped without authorization.

Best Lennox Support Route by Issue

Equipment is not heating or cooling: Contact the installing dealer or another qualified Lennox dealer.
Warranty coverage question: Use Lennox’s warranty lookup and call homeowner support.

Warranty repair: Contact a Lennox dealer because homeowners cannot submit equipment claims directly.
Installation or workmanship dispute: Begin with the independent dealer that sold and installed the system.
Product registration: Use Warranty Your Way and retain the registration certificate.

iComfort or smart-thermostat problem: Use Lennox thermostat support and homeowner customer care.
Commercial HVAC equipment: Call 1-800-453-6669.
Possible recalled ductless heat pump: Compare the complete model and serial number with the CPSC recall and contact the dealer.
Gas odor, smoke, sparks or carbon-monoxide alarm: Leave the affected area and address the immediate emergency before contacting routine support.

Privacy request: Use Lennox’s official privacy request route rather than ordinary repair support.

Information to Gather Before Contacting Lennox

Outdoor-unit model and serial numbers
Furnace, air-handler or indoor-coil model and serial numbers
Thermostat model
Installation date
Installing dealer’s name and telephone number
Current servicing dealer’s name and telephone number
Original proposal and invoice
Warranty registration certificate
Home closing date for new construction
Service invoices and diagnostic reports
Error code or thermostat alert
Date the problem began
Previous Lennox or dealer case numbers
The specific resolution being requested

Do not publish complete serial numbers, warranty certificates, invoices, account credentials or home-access information in a public review.

How to Find a Lennox Model and Serial Number

Lennox warranty and technical support depend on the exact model and serial numbers for each component in the system.

Air conditioner or heat pump: Check the data plate on the outdoor cabinet.
Furnace: Check inside the access panel or on the cabinet data plate.
Air handler: Check the cabinet label, commonly behind or near an access panel.

Indoor evaporator coil: Check the coil cabinet label.
Ductless system: Record the model and serial number from the outdoor unit and each indoor head.
Thermostat: Check the thermostat settings, equipment-information menu, back plate or original paperwork.

Turn off electrical power before removing an access panel when the manual requires it. Do not enter a live electrical compartment merely to locate a label.

Lennox Residential Office and Corporate Headquarters

Lennox publishes different addresses for residential operations, consumer correspondence and corporate matters:

Lennox Residential HVAC: 2100 Lake Park Boulevard, Richardson, TX 75080
Lennox International headquarters: 2140 Lake Park Boulevard, Richardson, TX 75080

Consumer-support correspondence: P.O. Box 799900, Dallas, TX 75379

Do not send HVAC equipment, thermostats, circuit boards, warranty parts or refrigerant components to any of these addresses without written authorization.

Lennox Dealers Are Independent Businesses

Lennox residential equipment is sold, installed and serviced through independent dealers. A dealer may be listed by Lennox, hold Premier Dealer status or complete Lennox training, but the dealership remains a separate business.

The independent dealer normally controls:

Equipment proposal and selling price
System sizing and load calculations
Installation workmanship
Ductwork modifications
Electrical, gas, drainage and refrigerant work
Appointment scheduling
Diagnostic and trip charges
Labor pricing
Dealer-provided labor warranty
Permit and inspection coordination
Financing arranged through the dealership

Lennox generally controls:

Manufacturer product specifications
Basic and extended equipment warranties
Product registration records
Covered replacement-part approval
Manufacturer technical information
Product recalls and safety notices

How to Find Another Lennox Dealer

A homeowner is not always required to use the original installer for later service. Another qualified Lennox dealer may be able to diagnose the system and submit an eligible manufacturer-warranty claim.

Before scheduling another dealer, ask:

Whether it services equipment installed by another company
Whether it submits Lennox warranty claims
Its diagnostic or trip charge
Its labor rate
Whether refrigerant and miscellaneous materials are separate
Whether it will provide a written diagnosis
Whether the repair is covered by its own labor warranty

Lennox Basic Limited Warranty

Lennox basic warranty coverage varies by product line and model. No registration is required for the basic limited warranty.

Dave Lennox Signature Collection

Generally 10 years on covered components
Generally 10 years on the compressor
Generally 20 years or limited lifetime on the heat exchanger, depending on the furnace model

Lennox Elite Series

Generally five years on covered components
Generally 10 years on the compressor
Generally 20 years or limited lifetime on the heat exchanger, depending on the furnace model

Lennox Merit Series

Generally five years on covered components
Generally five years on the compressor
Generally 20 years on the heat exchanger

Other Lennox Products

Healthy Climate indoor-air-quality products: Generally two or five years depending on the model
Comfort controls, thermostats and zoning: Generally five or 10 years depending on the model

Ductless mini-split systems: Generally five years on covered components

The warranty certificate for the exact model controls. Coverage can differ for older equipment, commercial applications, replacement products, accessories and equipment installed outside the United States or Canada.

Lennox Warranty Your Way

Eligible Lennox systems may qualify for an extended warranty choice at no additional charge.

Eligible Merit and Elite Equipment

The current choices generally include:

Up to 10 years of parts-only coverage; or
Up to seven years of parts coverage with three years of labor coverage

Eligible Dave Lennox Signature Collection Equipment

The current choices generally include:

Up to 12 years of parts-only coverage; or
Up to 10 years of parts coverage with three years of labor coverage

Eligibility and exact coverage depend on the product, installation, location and current Warranty Your Way terms.

Lennox Product Registration Deadline

In most jurisdictions, eligible equipment must be registered within 60 calendar days of:

The installation date for an existing home; or
The closing date for qualifying new construction

California, Florida, Quebec, Georgia for eligible equipment installed on or after January 1, 2026, and other jurisdictions that prohibit mandatory warranty registration have different rules. In those locations, qualifying equipment generally receives the default parts-only extension automatically, but the homeowner should still act within 60 days to select an available alternative that includes labor coverage.

The registration confirmation
Warranty certificate
Installing dealer invoice
Installation date
Model and serial numbers
Closing documents for new construction

Model or Serial Number Entered Incorrectly

If equipment was registered with the wrong model, serial number or installation date:

Photograph the correct equipment data plate.
Locate the original invoice.
Check the warranty lookup using the correct information.
Contact the installing dealer.
Call Lennox at 1-800-953-6669.
Ask for written confirmation after the registration record is corrected.

Do not create duplicate registrations without first asking Lennox how the original record should be corrected.

Does the Lennox Warranty Cover Labor?

Lennox’s basic factory warranty generally covers eligible replacement parts, not all labor and service expenses.

A homeowner may still be responsible for:

Diagnostic charges
Dealer trip charges
Removal and installation labor
Refrigerant
Nitrogen and brazing materials
Shipping or handling
Crane or lift costs
Ductwork changes
Electrical or plumbing work
Permit and inspection fees
Temporary heating or cooling

Labor may be covered when the homeowner selected an eligible Warranty Your Way parts-and-labor option, purchased Comfort Shield coverage or received a dealer-provided labor warranty.

Lennox Comfort Shield Coverage

Comfort Shield is a separate extended service agreement that can provide additional labor and related service coverage.

Available plans can vary but may include:

Labor coverage
Trip and diagnostic charges
Refrigerant coverage
Covered accessory repairs
Terms ranging from three to 12 years

Certain Comfort Shield plans may be purchased up to five years after installation and are described as transferable to a new homeowner. The certificate and state-specific terms control.

Is a Lennox Warranty Transferable?

Lennox currently describes the basic limited warranty as transferable to a later homeowner.

The extended limited warranty is generally limited to the original owner except where applicable law provides otherwise. An added labor portion may transfer under its terms. Comfort Shield transfer rules are governed by the separate service agreement.

A home buyer should request:

Original equipment invoice
Installation date
Model and serial numbers
Registration certificate
Warranty lookup results
Comfort Shield certificate
Dealer service history

How to File a Lennox Warranty Claim

A homeowner cannot submit an equipment warranty claim directly to Lennox.

Contact the installing dealer or another Lennox dealer.
Schedule a diagnosis.
Ask the dealer to identify the failed component in writing.

Ask whether the part is covered.
Request an itemized estimate for labor and uncovered materials.
Authorize the repair only after understanding the charges.
The dealer submits the warranty claim to Lennox.
Keep the final invoice and replacement-part information.

A covered part does not necessarily make the entire service call free.

Lennox Warranty Lookup Does Not Find the Equipment

If the online warranty lookup cannot locate the system:

Verify every character in the serial number.
Check whether a zero was entered as the letter O.
Check whether the indoor and outdoor units were confused.
Confirm the last name used for registration.
Ask the installer for the registration certificate.
Contact Lennox homeowner support.

Older equipment, incorrect installation records, replacement components or a registration under a prior homeowner can require manual review.

Lennox Installation Complaints

An installation complaint may involve:

Improper system sizing
Insufficient airflow
Poor duct design
Refrigerant leaks
Condensate drainage
Electrical or breaker problems
Gas piping or venting
Excessive noise or vibration
Thermostat setup
Missing permits or inspections
Failure to register the equipment
Equipment that does not match the proposal

How to Document an Installation Complaint

Save the proposal and contract.
Photograph every equipment data plate.
Keep permit and inspection records.
Request commissioning and startup information.
Save temperature, humidity and utility information.
Request written diagnostic findings.
Keep all texts and emails with the dealer.
Obtain a second opinion when appropriate.

Give the installing dealer a reasonable opportunity to inspect and correct its work unless an immediate safety concern requires another qualified professional.

How to Escalate a Lennox Dealer Complaint

Contact the dealership’s service manager.
Provide the invoice, model numbers and service history.
Ask for the diagnosis and proposed resolution in writing.
Request the dealership owner or general manager when unresolved.
Contact Lennox homeowner support and request a case number.
Explain which issues concern the Lennox product and which concern dealer workmanship.
Use another qualified Lennox dealer for a documented second opinion when necessary.

Preserve all warranty, permit, financing and payment records.

Lennox may help explain product coverage or communicate with a dealer, but it may not directly control an independent dealer’s labor price, scheduling or contractual obligations.

Lennox Air Conditioner Is Not Cooling

Before requesting service, check:

Thermostat is set to Cooling
Requested temperature is below room temperature
Thermostat batteries or power
Air filter condition
Supply and return vents are open
Indoor and outdoor breakers
Outdoor disconnect has not been turned off
Condensate float switch or drain problem
Ice on the refrigerant line or indoor coil
Outdoor unit is free of obvious debris

Do not open electrical compartments, bypass safety switches, add refrigerant or continue operating equipment that is smoking, sparking or producing a burning odor.

Lennox Furnace Is Not Heating

Check:

Thermostat is set to Heating
Requested temperature is above room temperature
Furnace switch is on
Breaker is on
Filter is not blocked
Access panel is properly installed
Gas service is available
Condensate drain is not blocked on a high-efficiency furnace
Diagnostic light or thermostat shows an error

Do not repeatedly reset a furnace that locks out, overheats, produces soot, smells of gas or shows evidence of improper venting.

What to Do if You Smell Gas

Do not try to light an appliance.
Do not use switches, thermostats, telephones or electronics inside the building.
Do not create a flame or spark.
Leave the building.
Call the gas supplier or emergency services from a safe location.
Do not return until the responsible authority says it is safe.

Lennox Heat Pump Is Icing

A heat pump can develop a light layer of frost during heating and periodically enter defrost mode. A thick ice buildup that remains, blocks airflow or returns repeatedly can involve:

Airflow restriction
Defrost-control failure
Outdoor fan problem
Low refrigerant charge
Sensor problem
Drainage or weather-related ice accumulation

Do not chip ice from the coil or pour hot water over electrical equipment. Contact a qualified HVAC dealer.

Lennox System Is Leaking Water

Water around an indoor unit may result from:

Blocked condensate drain
Failed condensate pump
Frozen evaporator coil
Cracked drain pan
Improper drain installation
High humidity or insufficient airflow

Turn off the system when continuing operation could cause property damage. Protect the area and contact a qualified service company.

Lennox System Makes Unusual Noise

Contact a technician for persistent:

Grinding
Metal scraping
Loud buzzing
Repeated breaker tripping
Compressor banging
Blower vibration
Refrigerant hissing accompanied by loss of performance

Record a short video from a safe location and note when the noise occurs. Do not remove guards or touch moving equipment.

Lennox iComfort and Smart-Thermostat Support

Thermostat complaints may involve:

Blank screen
Lost Wi-Fi connection
Account-login problem
Incorrect temperature
Equipment not responding
Mobile-app synchronization
Google or Amazon integration
Schedule or zoning problems
Thermostat replacement

Before resetting or replacing the thermostat:

Record the thermostat model.
Record displayed alerts and error codes.
Confirm HVAC equipment has power.
Confirm Wi-Fi and internet service.
Check the app for updates.
Save schedules and account information when possible.
Contact Lennox or the installing dealer.

Do not bypass low-voltage wiring or connect a thermostat that has not been confirmed compatible with the Lennox system.

Lennox Filters and Airflow Problems

Restricted airflow can reduce comfort and contribute to freezing, overheating, high energy use and equipment shutdown.

Check:

Correct filter size
Correct airflow direction
Filter replacement interval
Return grilles are not blocked
Supply registers are open
Indoor coil and blower require professional cleaning
High-efficiency filter is compatible with the system

Do not replace a filter with a highly restrictive model without confirming that the system and ductwork can handle it.

Lennox Ductless Heat-Pump Recall

A 2020 CPSC recall involved certain Lennox ductless single-zone and multi-zone heat-pump outdoor units because internal electrical components could fail and allow the unit to overheat.

The listed models were:

MPA018S4M-1P
MPA048S4S-1P
MPA048S4M-1P

The recall applied to specified serial numbers beginning with 6915 or 6916.

Owners should:

Locate the outdoor-unit model and complete serial number.
Compare both with the official CPSC recall.
Contact the installing servicer, dealer or contractor.
Follow current operating and remedy instructions.
Do not open or modify the outdoor unit.

Review the official Lennox Ductless Heat-Pump Recall.

Repairing or Replacing a Lennox System

Ask for a written repair-versus-replacement comparison when an older system has a major failure.

Consider:

Equipment age
Remaining warranty
Compressor or heat-exchanger condition
Refrigerant type
Repeated repair history
Availability and lead time of parts
Energy use
Condition of ductwork
Current tax-credit or rebate eligibility
Labor warranty on the proposed replacement

A covered replacement part can still involve substantial labor, refrigerant and service charges. Request an itemized estimate before authorizing work.

Before Buying a New Lennox System

Request a written proposal identifying:

Every model number
System capacity
Efficiency rating
Refrigerant type
Thermostat
Indoor-air-quality accessories
Ductwork and electrical work
Permit and inspection responsibility
Manufacturer warranty
Dealer labor warranty
Warranty Your Way selection
Comfort Shield coverage
Total installed price
Payment schedule

Confirm that the final installed model numbers match the signed proposal.

How to File a Lennox Complaint

Identify the responsible party. Determine whether the issue concerns the Lennox product, independent dealer, installer, service contractor, financing provider or home builder.
Document the equipment. Photograph every model and serial number privately.
Gather records. Keep proposals, invoices, permits, registration certificates and repair reports.

Contact the dealer. Request written diagnosis and resolution.
Contact Lennox. Call 1-800-953-6669 and request a case number.
Ask about warranty coverage. Separate covered parts from labor and other charges.
Request escalation. Ask for dealer management or Lennox case review when appropriate.
Keep all records. Save emails, invoices, photographs and shipment information.

What to Include in a Lennox Complaint

Equipment model and serial numbers supplied privately
Installation date
Installing and servicing dealer
Purchase price
Warranty and registration status
Date the problem began
Diagnostic findings
Parts replaced
Labor and refrigerant charges
Previous dealer and Lennox case numbers
The specific resolution requested

Possible resolutions include additional diagnosis, installation correction, covered replacement part, warranty registration correction, dealer referral, thermostat assistance, recall processing or a written explanation of why coverage does not apply.

How to Escalate an Unresolved Lennox Complaint

Reply through the existing Lennox case.
Provide the case number and written dealer findings.
Ask whether Lennox considers the issue a product defect, installation problem or maintenance issue.
Ask what portion of the repair is covered.
Request supervisor or regional review when appropriate.
Obtain a second written diagnosis from another qualified dealer if necessary.

Keep all invoices and failed-part information.
Ask for the final position in writing.

Lennox Company Information

Company: Lennox International Inc.
Corporate headquarters: 2140 Lake Park Boulevard, Richardson, TX 75080
Corporate phone: 1-972-497-5000
Residential HVAC location: 2100 Lake Park Boulevard, Richardson, TX 75080
Residential homeowner support: 1-800-953-6669
Consumer-support mailing address: P.O. Box 799900, Dallas, TX 75379
Commercial HVAC support: 1-800-453-6669

Lennox International is a publicly traded climate-control company. The corporate headquarters does not replace the independent dealer responsible for installing and servicing a residential system.

Lennox Customer Service Reviews and Complaints

CustomerServiceNumbers.com currently shows Lennox with 3.0 out of 5 stars based on one review.

The review was submitted on March 30, 2018, with the title “Merit Ml 180 typed model number in wrong.” No additional explanatory review text is visible.

The review may concern an incorrectly entered ML180 model number, but it does not provide enough detail to determine whether the issue involved registration, warranty lookup, a product review or another process.

The single review does not establish current patterns involving Lennox equipment quality, energy efficiency, independent-dealer workmanship, warranty claims, repair pricing or customer-service response.

Lennox Customer Service Frequently Asked Questions

What is the Lennox customer-service phone number?

Residential homeowners can call Lennox at 1-800-953-6669.

What are Lennox customer-service hours?

Current residential Lennox pages list Monday–Friday, 8:00 a.m.–6:00 p.m. Central Time.

Does Lennox offer email support?

Lennox directs residential homeowners to its online contact form and chat rather than publishing one general homeowner-support email address.

How quickly does Lennox answer the contact form?

Lennox says a representative should respond within approximately three business days. Contact a dealer for immediate equipment service.

How do I find a Lennox repair company?

Use the official Lennox Dealer Locator and confirm the dealer’s diagnostic fee, labor rate and warranty-claim services before scheduling.

Can I file a Lennox warranty claim myself?

No. A Lennox dealer must diagnose the equipment and submit the manufacturer-warranty claim.

Does Lennox’s warranty cover labor?

The basic factory warranty generally covers parts. Labor may be covered through an eligible Warranty Your Way selection, a dealer labor warranty or a separate Comfort Shield agreement.

How long do I have to register Lennox equipment?

Most eligible systems must be registered within 60 days of installation or new-home closing. Different rules apply in jurisdictions that prohibit registration requirements, including Florida and California.

What happens if my Lennox model or serial number was entered incorrectly?

Photograph the correct data plate, gather the invoice and contact the installer and Lennox to have the registration record reviewed.

Is the Lennox warranty transferable?

The basic limited warranty is generally transferable. The extended limited warranty is usually restricted to the original owner, although added labor coverage may transfer. Check the exact certificate.

Can another Lennox dealer perform warranty service?

Another qualified Lennox dealer may be able to diagnose the equipment and submit a claim. Ask about diagnostic, labor and refrigerant charges first.

Why am I being charged labor for a warranty repair?

A covered manufacturer part does not necessarily include the dealer’s labor, trip charge, diagnosis, refrigerant or installation materials.

Where is Lennox headquartered?

Lennox International is headquartered at 2140 Lake Park Boulevard, Richardson, Texas 75080.

Is the Lennox dealer part of Lennox International?

Lennox residential dealers listed through the locator are independent businesses rather than Lennox corporate offices.

Related HVAC Customer Service Pages

Why Trust CustomerServiceNumbers.com?

CustomerServiceNumbers.com has helped consumers locate company contacts, complaint routes, ratings and customer reviews since 2004.

We are an independent consumer-help website and are not owned or operated by Lennox International, a Lennox dealer, HVAC contractor, home builder, warranty administrator, financing provider, utility company or government safety agency.

Our goal is to help homeowners identify the correct support provider, understand the difference between manufacturer and dealer responsibilities, document warranty and installation problems, protect private household information and report whether an issue was resolved.

Share Your Lennox Customer Service Experience

Have you contacted Lennox about an air conditioner, heat pump, furnace, mini-split, thermostat, indoor-air-quality product, warranty registration, replacement part, dealer dispute, labor charge or recall?

Leave a review below and explain:

Which Lennox product was involved
The product family without publishing complete serial information
Approximately when it was installed
Whether the issue involved Lennox or an independent dealer
Which support route you used
Whether a Lennox or dealer case number was created
What warranty or repair decision was made
Whether the issue was resolved

Privacy and safety warning: Do not publish complete serial numbers, warranty certificates, home addresses, telephone numbers, personal emails, service-order numbers, financing information, payment details, thermostat passwords, Wi-Fi credentials, access codes, utility-account information, private technician information or photographs revealing private areas of a home. Leave the building and contact emergency assistance for a gas odor, carbon-monoxide alarm, smoke, fire or another immediate hazard.

Page Update Note

This Lennox customer service page was updated on July 24, 2026, to verify residential, commercial and corporate telephone numbers; correct current homeowner-support hours; add chat, the online form and response guidance; distinguish corporate, residential and consumer-mailing addresses; explain the independent-dealer structure; add current basic warranty, Warranty Your Way, registration, labor, transfer, Comfort Shield and dealer-claim information; add installation, cooling, heating, thermostat, airflow, recall, safety and complaint-escalation guidance; remove unsupported review claims; and accurately summarize the single live CustomerServiceNumbers.com review.

Customer Service Information Disclaimer

CustomerServiceNumbers.com is not affiliated with Lennox International Inc., Lennox Residential, Lennox Commercial, any Lennox dealer, HVAC contractor, home builder, warranty administrator, Comfort Shield provider, utility, financing company or the U.S. Consumer Product Safety Commission.

This page is provided for informational, complaint and review purposes only. CustomerServiceNumbers.com cannot diagnose HVAC equipment, dispatch a technician, register a product, submit a warranty claim, approve a replacement part, reimburse labor, repair gas or electrical equipment, correct a thermostat account, process a recall or determine whether a system is safe to operate.

Telephone numbers, hours, addresses, warranty terms, registration deadlines, state-specific rules, dealer status, labor coverage, Comfort Shield plans, recall remedies, product compatibility and service procedures can change. Confirm important information through Lennox, the current warranty certificate, installing or servicing dealer, qualified licensed professionals, gas utility, emergency services and appropriate government agencies before taking action.

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Lennox Customer Service: Warranty, Repairs and Reviews