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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 15CB-Y Wiring Diagram Instructions

September 22, 2026
Lennox 15CB-Y Wiring Diagram Electric Heating Unit Installation Use the provided cut size and component layout to install the electric heating unit with correct wiring practices, including using copper conductors…

LENNOX ComfortSense 7500 Commercial Thermostat User Guide

September 22, 2026
Comfort Sense® 7500 Commercial Thermostat User Guide 507505-02 6/2018 Supersedes 5/2017 Features The Comfort Sense® 7500 Series thermostat is an electronic 7-day, universal, multi-stage, programmable, touchscreen thermostat. supports commercial package…

Lennox E40 Energy-Efficient Thermostat User Manual

September 22, 2026
Lennox E40 Smart Wi‑Fi Thermostat Overview The Lennox E40 is a smart, programmable 7-day touchscreen thermostat with Wi‑Fi connectivity. It supports multi-stage heating/cooling and enhanced indoor comfort features such as…

LENNOX SL297UHNVK Series Gas Furnace User Manual

September 19, 2026
LENNOX SL297UHNVK Series Gas Furnace ⚠ WARNING: A2L Refrigerant DetectionThis furnace is equipped with an ignition control factory-enabled for use with Lennox A2L refrigerant systems. Disabling the refrigerant detection functionality…

LENNOX 5500 ComfortSense Thermostat User Guide

September 19, 2026
LENNOX 5500 ComfortSense Thermostat Overview The ComfortSense® 5500 Series thermostat is a touchscreen, electronic 7-day programmable thermostat with features such as smooth setback recovery, compressor short-cycle protection, real-time clock backup,…

LENNOX LF25-30-105 Compact Unit Heater User Manual

September 17, 2026
LENNOX LF25-30-105 Compact Unit Heater SPECIFICATIONS SPECIFICATIONS Gas Heating Performance Model No. LF25-30A LF25-45A LF25-60A LF25-75A LF25-90A LF25-105A Heating Capacity Input Btuh 30,000 45,000 60,000 75,000 90,000 105,000 Heating Capacity…

LGT-LCT156H Rooftop Packaged Units

Installation Guide
LGT-LCT156H, LGT-LCT180H, LGT-LCT210H, LGT-LCT240H, LGT-LCT300H, LGT-LCT156H Rooftop Packaged Units, LGT-LCT156H, Rooftop Packaged Units, Packaged Units

LDT078 Ldt Dual Fuel Rooftop HVAC Units

Instruction Manual
LDT078, LDT092, LDT102, LDT120, LDT152, LDT078 Ldt Dual Fuel Rooftop HVAC Units, LDT078, Ldt Dual Fuel Rooftop HVAC Units, Fuel Rooftop HVAC Units, Rooftop HVAC Units, HVAC Units

L Rooftop Units Catalog

Datasheet
LTM, ENLIGHT, XIONTM, LGM, LCM, LGT, LCT, LHT, LDT, LGX, LCX, LHX Formerly K C, ZGD, ZCD, ZHD, L Rooftop Units Catalog, Rooftop Units Catalog, Rooftop Units

LDT Enlight Rooftop Unit

Instruction Manual
L D T 102 H 5 E S 2 Y, LDT Enlight Rooftop Unit, LDT, Enlight Rooftop Unit, Rooftop Unit, Unit

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.