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Merit® Series



Mid-efficiency, two-stage air conditioner

Price Guide
Efficiency Rating (SEER)
up to 18
Efficiency Rating (SEER 2)
up to 17.8
Energy Star®

Merit models come with a 5-Year Limited Warranty on compressors and a 5-Year Limited Warranty on covered components. A 10-Year Extended Limited Warranty is available with product registration. For more information, visit

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Illustration of Balanced comfort and efficiency

Balanced comfort and efficiency

Balanced comfort and efficiency

While most air conditioners are single stage, meaning they're either on or off, this air conditioner can heat or cool at two different speeds. Most of the time the unit will meet cooling needs at its lower speed, resulting in balanced and consistent temperatures with lower energy use.

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Our Uncontested Quantum™ Coil

With years of rigorous testing under the most extreme conditions, our Quantum Coil – featuring a proprietary aluminum alloy exclusive to Lennox – is designed to weather the harshest elements.

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Cabinets built to last

Built to be more durable and easier to install and serviced thanks to proprietary designs and superior materials. Compared with similar competitive products, the Lennox Merit Series doesn't compromise on the metal thickness used in its cabinets, making them more rigid and stable over time.

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Efficient and Affordable

The ML18XC2 offers energy efficiencies of up to 18.00 SEER and 17.8 SEER2, delivering comfort and energy savings at a more affordable price.

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ENERGY STAR® Certified

Heating, ventilation and air-conditioning (HVAC) equipment with the ENERGY STAR label meets or exceeds federal guidelines for energy-efficient performance. An ENERGY STAR-certified AC unit could cut your cooling costs by 30 percent.

ENERGY STAR<sup>®</sup> Certified
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Humidity control

Pairing your air conditioner with a variable-speed furnace or air handler allows you to continuously maintain a slow circulation of air throughout your home, decreasing the amount of humidity in your home for improved indoor air quality and comfort.

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Ratings & Reviews

See what other customers are saying about
ML18XC2 Air Conditioner

5 Stars 5/5

Paired with the SL280NV

January 17, 2024

I love this unit, it is very very quiet and saw 60% savings compared to my 25 year old previous system!

Max Delvino

La Puente

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Energy Star

Proper sizing and installation of equipment is critical to achieve optimal performance. Split system air conditioners and heat pumps (excluding ductless systems) must be matched with appropriate coil components to meet ENERGY STAR criteria. Ask your contractor for details or visit

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