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Lennox International Manuals & User Guides

Lennox provides innovative, energy-efficient climate control solutions, including premier heating, ventilation, air conditioning, and refrigeration (HVACR) systems.

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Lennox International

Lennox International is a leading provider of innovative and energy-efficient climate control solutions for both residential and commercial applications. For over a century, Lennox has been at the forefront of the heating, ventilation, air conditioning, and refrigeration (HVACR) industry. Their diverse product lines include robust furnaces, air conditioners, heat pumps, and indoor air quality systems designed to create comfortable, healthy environments.

Whether installing a residential AC unit or maintaining commercial rooftop units, Lennox emphasizes safety, performance, and sustainability. Given the complexity of HVAC systems, their equipment requires professional installation and care. Lennox supports its products with comprehensive user manuals, service guides, and instructional documents to ensure reliable and efficient operation by licensed professionals and informed homeowners.

Lennox International manuals

Latest manuals from manuals+ curated for this brand.

LENNOX EL195UH060NE36BK Gas Heating Units User Manual

June 16, 2026
LENNOX EL195UH060NE36BK Gas Heating Units Specifications Cut Size: 6-1/2 inches Wide x 8-3/16 inches Tall Power Supply: 120V AC (if used) Fuse: 3A (F1) Thermostat Heat Anticipation Settings: Honeywell Valve:…

LENNOX D4P120 Smoke Detector Kits Installation Guide

June 16, 2026
LENNOX D4P120 Smoke Detector Kits Specifications Model Numbers: D4P120 & D4S Smoke Detector Kits Part Numbers: 39U76 (Single-sensor kit), 39U75 (Dual-sensor kit) Compatibility: ZG/ZC/ZH 036-150 Units Functionality: Smoke detector interrupts…

LENNOX EL16KP1 Outdoor units Instruction Manual

June 8, 2026
LENNOX EL16KP1 Outdoor units Product Specifications Model: Merit EL16KP1 (R-454B) Series Outdoor Units Refrigerant: R-454B only Matching: Must be matched with an approved indoor air handler or coil as specified…

LENNOX EL21KLV Outdoor Units Instruction Manual

June 8, 2026
LENNOX EL21KLV Outdoor Units Specifications Model Number: EL21KLV Product Tier: EL (Elite Series) Nominal SEER2: 21 (20.5) Refrigerant: R454B only Compressor Type: Variable capacity rotary compressor Coil Type: All-aluminum coil…

LENNOX M40 Smart Thermostat User Guide

June 2, 2026
LENNOX M40 Smart Thermostat Features The LennoxĀ® M40 Smart thermostat recognizes and connects to all LennoxĀ® communicating products to automatically configure and control the heating/ cooling system (based on user-specified…

LENNOX ML193UHE(K) Merit Series Gas Furnace Owner’s Manual

June 2, 2026
LENNOX ML193UHE(K) Merit Series Gas Furnace MODEL NUMBER IDENTIFICATION FEATURE HIGHLIGHTS Lennox Duralok Plusā„¢ Heat Exchanger Secondary Heat Exchanger Inshot Burners Gas Control Valve Flame Rollout Switch Combustion Air Inducer…

LENNOX 508850-01 Refrigerant Installation Guide

May 27, 2026
Ā©2026 508850-01 Refrigerant WARNING To prevent serious injury or death: LockĀ­out/tagĀ­out before performing maintenance. If system power is required (e.g., smoke detector maintenance), disable power to blower, remove fan belt…

Lennox International support FAQ

Common questions about manuals, registration, and support for this brand.

  • Where can I find the user manual for my Lennox system?

    You can find user manuals, installation instructions, and service guides directly on the Lennox website or by searching for your specific model on Manuals.plus.

  • How do I contact Lennox customer support?

    You can reach Lennox customer support by calling 1-800-953-6669 or by using the contact form on their official website at lennox.com/contact-us.

  • Where can I look up my Lennox HVAC system warranty?

    You can easily check your warranty coverage using the warranty lookup tool on the Lennox website at lennox.com/residential/owners/assistance/warranty/.

  • Can I install my Lennox replacement parts or systems myself?

    No. Lennox strongly recommends that all installation, adjustment, and service must be performed by a licensed professional HVAC installer or service agency to avoid property damage, personal injury, or voiding your warranty.