3 Ton Merit Single Stage System – Reliable Comfort for Your Home
The 3 Ton Merit Single-Stage System delivers dependable, energy-efficient heating and cooling with a SEER2 of 16 and EER2 of 13.8. This complete HVAC bundle includes the ML14KC1 air conditioner, ML180E furnace, and CK40HT-42B-71 horizontal evaporator coil, providing quiet, reliable performance all year long.
With ENERGY STAR® certification, dual-fuel capability, and built-in Refrigerant Detection System, this system balances comfort, efficiency, and safety. Its braze-free installation also makes setup easier and more flexible. Perfect for homeowners seeking an affordable, complete HVAC solution, while our Elite systems offer even higher energy savings and advanced performance.
✅ Powerful 3 Ton single-stage heating and cooling ✅ Energy-efficient SEER2 16 / EER2 13.8 ✅ Quiet, durable, and low-maintenance ✅ Complete bundle with AC, furnace, and horizontal coil
3 Ton Merit Single-Stage System – Complete Home Comfort Made Easy
Upgrade your home’s climate control with the 3 Ton Merit Single-Stage System. This complete bundle combines the ML14KC1 air conditioner, ML180E gas furnace, and CK40HT-71 horizontal evaporator coil to deliver year-round comfort, efficiency, and reliability.
SEER2: 16
EER2: 13.8
With a SEER2 of 16 and EER2 of 13.8, this system balances performance with energy savings. Plus, it’s built to meet 2025 refrigerant standards, so you can enjoy comfort while reducing your environmental footprint.
Powerful Cooling – ML14KC1 Air Conditioner
The ML14KC1 delivers consistent, dependable cooling with a 14.30 SEER2 efficiency rating. It is ENERGY STAR® Certified and eligible for federal tax credits, helping you save money while keeping your home comfortable. The high-efficiency outdoor coil improves heat transfer, and the single-stage compressor provides steady cooling exactly when you need it. In addition, this unit operates quietly, with sound levels as low as 73 dB.
Efficient Heating – ML180E Furnace
The ML180E furnace ensures even, reliable heat with an 80% AFUE efficiency rating. Its Power Saver™ constant torque motor automatically adjusts airflow for smoother, quieter operation. When paired with a Lennox® heat pump, it provides dual-fuel capability, switching seamlessly between gas and electricity to maximize efficiency and comfort.
Durable Horizontal Coil – CK40HT-42B-71
The CK40HT-42B-71 evaporator coil enhances heat transfer while maintaining quiet operation. Its horizontal, aluminum-cased design includes a factory-installed TXV and Refrigerant Detection System (RDS) for safe, efficient performance. Additionally, it supports braze-free installation, making setup simpler and more flexible for your heating & air conditioning units.
Why Choose the 3 Ton Merit System?
This bundle is perfect for homeowners looking for a complete central air AC unit solution. It simplifies maintenance, qualifies for federal tax credits, and ensures long-lasting performance. Whether you’re upgrading your heating and air supplies or installing a new air conditioning system, this system delivers reliability, efficiency, and peace of mind.
Key Benefits at a Glance ✅ Powerful 3 Ton single-stage cooling and heating ✅ SEER2 16 and EER2 13.8 for energy savings ✅ Quiet and durable components for long-lasting comfort ✅ Complete bundle with air conditioner, furnace, and horizontal coil ✅ Braze-free installation flexibility for modern HVAC setups ✅ Built-in Refrigerant Detection System for enhanced safety ✅ Ideal air conditioning units for homes solution
Air Conditioner Overview
Model #: ML14KC1-036
Product Overview:
Merit® Series | ML14KC1 Air Conditioner – Standard-Efficiency, Future-Ready Cooling
The Merit® Series ML14KC1 is a reliable, standard-efficiency air conditioning system designed to deliver consistent comfort and long-lasting performance. With its single-stage compressor and compatibility with 2025 Compliant Refrigerant, this air conditioner unit provides affordable, energy-efficient cooling while meeting the latest EPA standards. Moreover, it is an excellent choice for homeowners searching for heating and air conditioning units that combine efficiency and dependability.
Energy Efficiency & Performance
This unit meets or exceeds a 14.30 SEER2 efficiency rating, making it an ideal central air conditioning system for modern homes. Additionally, it is ENERGY STAR® Certified, recognized for exceeding federal energy-efficiency guidelines, and is eligible for the Federal Tax Credit under the Energy Efficient Home Improvement Credit (IRC Section 25C). Its high-efficiency outdoor coil ensures excellent heat transfer and reduced air resistance for optimal performance. With a single-stage compressor, it runs at full capacity when needed, providing reliable home air conditioner operation.
Quiet & Comfortable Operation
Operating at sound levels as low as 73 dB, the ML14KC1 promotes a quieter home environment. Furthermore, its precision-balanced, direct-drive outdoor fan reduces noise while enhancing product longevity, making it an excellent air conditioning unit for homes that prioritize comfort.
Craftsmanship & Reliability
The Quantum™ Coil, made from an exclusive aluminum alloy, is engineered for durability and tested under extreme conditions. The heavy-gauge, galvanized steel cabinet, complete with louver coil guard, zinc-coated steel base, and baked-on powder finish, resists rust and corrosion. Additionally, braze-free installation offers flexibility for 2025 compliant systems, and built-in drainage holes prevent moisture accumulation inside the base pan, ensuring reliable heating and cooling supplies for years to come.
Safety & Sustainability
Using R-454B refrigerant, the ML14KC1 complies with 2025 EPA lower-GWP standards. It is also equipped with a Refrigerant Detection System (RDS) for A2L refrigerant safety compliance—sensors detect leaks, stop operation, and activate the indoor blower to safely disperse refrigerant. This makes it a safe and environmentally responsible air conditioning system replacement.
Complete Comfort System Option
Homeowners can pair the ML14KC1 Air Conditioner with a compatible Lennox® furnace and evaporator coil to create a full, year-round heating and air conditioning company-grade system. This combination ensures efficient, safe, and reliable central air AC unit operation for ultimate home comfort.
Key Benefits at a Glance
✅ Standard-efficiency air conditioner unit with 14.30 SEER2 rating ✅ ENERGY STAR® Certified and federal tax credit eligible ✅ Durable Quantum™ Coil built to withstand extreme conditions ✅ Quiet operation at sound levels as low as 73 dB ✅ Flexible braze-free installation design ✅ Built-in Refrigerant Detection System for enhanced safety ✅ Bundle option available with furnace and coil for complete home comfort
Product Specifications:
Brand
Lennox
Catalog Number
25C89
Model/Part Number
ML14KC1-036-230
Base Unit of Measure
Unit(S)
Family
ML14KC1
Series
Merit
Type
Single-Stage Air Conditioner
Nominal Cooling Capacity
3 Ton
Product Voltage
208-230 VAC 1 Ph 60Hz
Product Width
28.7 Inch
Product Height
37.1 Inch
Compressor Type
1 Stage
Number of Compressors
1 Compressor
SEER2
Meets or exceeds 14.30 SEER2
Gross Weight
200.0 Lbs
Liquid Line OD
3/8 Inch
Suction Line OD
7/8 Inch
Energy Star Certified
Yes
Refrigerant Type
R-454B
Product Length
28.7 Inch
Furnace Overview
Model #: ML180UH070E36B
Order #: 81W23
Product Overview
Merit® Series | ML180E Gas Furnace – Economical Heating with Power Saver™ Technology
The Lennox® Merit® Series ML180E gas furnace delivers dependable heating at an affordable price while maximizing efficiency. Featuring the Power Saver™ constant torque motor, this HVAC system automatically adjusts airflow based on demand. As a result, it runs more efficiently than a standard motor and provides consistent comfort throughout your home. Built with durable steel construction and dual-fuel capability, this furnace ensures long-lasting performance and year-round flexibility.
Energy Efficiency & Heating Performance
With an 80% AFUE efficiency rating, the ML180E helps maintain comfort while keeping energy costs under control. In addition, the Power Saver™ motor enhances airflow efficiency, reducing wasted energy and improving indoor air circulation.
For homeowners who want even greater savings, the ML180E is dual-fuel capable. When paired with a Lennox® heat pump, the system can automatically switch between gas and electricity depending on which option is most efficient. This not only optimizes heating performance, but also minimizes fossil fuel use.
Quiet & Comfortable Operation
Unlike single-speed motors, the constant torque motor delivers smoother and quieter airflow. This creates a more peaceful indoor environment while helping to reduce temperature swings. In addition, consistent heat distribution minimizes hot and cold spots, ensuring every room stays comfortable.
Craftsmanship & Reliability
Every detail of this home furnace is designed for long-term reliability. With high-quality steel construction and rigorous testing, the ML180E is built to withstand demanding conditions. Furthermore, Lennox’s long-standing reputation for quality means you can count on years of dependable operation.
Safety & Sustainability
This gas furnace meets all industry safety standards, ensuring safe and reliable heating. The dual-fuel system option helps reduce reliance on natural gas by working in tandem with an electric heat pump, providing both environmental and cost-saving benefits.
Complete Comfort System Option
For all-season performance, the ML180E pairs seamlessly with a Lennox® air conditioner or heat pump. Together, they form a complete HVAC system that delivers efficient cooling in summer and reliable heating in winter.
Key Benefits at a Glance
✅ 80% AFUE efficiency rating for affordable comfort ✅ Power Saver™ constant torque motor improves efficiency and airflow ✅ Dual-fuel capable with a Lennox® heat pump pairing ✅ Durable steel construction ensures long-lasting reliability ✅ Quiet operation with smoother, consistent airflow ✅ Bundle option with air conditioner or heat pump for year-round comfort
Product Specifications:
Brand
Lennox
Catalog Number
81W23
Model/Part Number
ML180UH070E36B
Base Unit of Measure
Unit(S)
Family
ML180E
Series
Merit
Heating Capacity
66000 Btuh
Heating Efficiency
80% AFUE
Configuration
Upflow/Horizontal
Blower Size
3 Ton
Gas Stages
1 Stage Heat
Blower Type
Constant Torque
Product Voltage
115 VAC 1 Ph 60 Hz
Product Depth
27.75 Inch
Product Width
17.5 Inch
Product Height
33 Inch
Gross Weight
127 lbs.
Type
1-Stage Constant Torque Horizontal Gas Furnace
Energy Star Certified
No
California Only
This furnace does not meet the South Coast Air Quality Management District (SCAQMD) Rule 1111 and San Joaquin Valley Air Pollution Control District (SJVAPCD) Rule 4905 NOx emission limit (14 ng/J) and cannot be installed within the SCAQMD and SJVAPCD areas.
The CK40HT-71 is a horizontal, full-cased air conditioning unit designed for use with Lennox® air conditioners units and heat pump AC systems. Engineered specifically for R-454B refrigerant, this coil combines efficiency, durability, and safety. Additionally, factory-installed components, such as a thermostatic expansion valve and Refrigerant Detection System (RDS) sensor, ensure dependable heating and cooling units operation while maintaining compliance with A2L refrigerant safety standards. Homeowners searching for reliable air conditioning systems for sale will find this unit an excellent choice.
Energy Efficiency & Performance
This evaporator coil is available in 1.5- to 5-ton capacities, supporting a wide range of central air conditioning units and home air conditioner applications. The factory-installed R-454B thermostatic expansion valve promotes efficient operation, while the large coil surface area maximizes heat transfer and improves overall system efficiency. Furthermore, minimal air resistance ensures smoother airflow and optimized performance, making it an effective air conditioning supply option.
Quiet & Comfortable Operation
Its horizontal, full-cased design supports flexible installation in various configurations, allowing for quieter air conditioner units for homes operation. Efficient airflow contributes to reduced noise levels and enhanced overall comfort for any household air conditioning system replacement.
Craftsmanship & Reliability
Braze-free installation capability simplifies setup and adds flexibility for heating and air conditioning units. Sleeved distributor tubes and rifled aluminum tubing enhance coil durability, while the non-corrosive, UV-resistant polymer drain pan with dual connections resists leaks and extends service life. Improved gasketing reduces moisture intrusion, ensuring long-term reliability for your central air AC unit.
Safety & Sustainability
The factory-installed RDS sensor communicates with the blower control to initiate a flush sequence if a refrigerant leak is detected, ensuring safe operation. Factory-applied A2L refrigerant labeling supports compliance with 2025 safety standards. Additionally, this coil is fully compatible with R-454B refrigerant, meeting lower-GWP EPA regulations, making it a safe and environmentally responsible air conditioning system replacement. The included RDS line set sleeve ensures safe installation per manufacturer instructions.
Manufacturer Cross-Reference
Equivalent to: Goodman CHPT, Daikin CHPT, Franklin CHPT, Amana CHPT
Key Benefits at a Glance
✅ Horizontal, full-cased R-454B dedicated air conditioning unit ✅ Factory-installed TXV for high-efficiency operation ✅ Built-in RDS sensor with flush sequence for safety ✅ Braze-free installation flexibility ✅ Durable construction with rifled aluminum tubing and sleeved distributor tubes ✅ Non-corrosive, UV-resistant polymer drain pan with dual connections ✅ Compatible with Goodman, Daikin, Franklin, and Amana CHPT models
SEER stands for Seasonal Energy Efficiency Ratio. It measures the cooling efficiency of an air conditioner or heat pump over an entire cooling season. Essentially, it tells you how much cooling output (BTUs) you get for every unit of energy (watt-hour) used.
Higher SEER = more efficient
SEER ratings have traditionally been used in the U.S. to compare energy efficiency across systems.
Example: A 14 SEER unit uses less electricity than a 10 SEER unit to produce the same cooling.
What is SEER2?
SEER2 is the updated efficiency rating standard that reflects new federal testing procedures implemented by the Department of Energy (DOE) in 2023. It measures efficiency more accurately by accounting for real-world conditions, including:
Energy usage in modern airflow and installation configurations
More realistic climate and seasonal variations
Changes in the refrigerants and equipment designs
Key difference: SEER2 ratings tend to be slightly lower than SEER ratings for the same unit, but they provide a truer representation of actual efficiency in your home.
Why SEER2 is the new standard
The DOE updated testing to better match how systems perform in real homes, rather than ideal lab conditions.
It encourages manufacturers to improve real-world efficiency, not just test-case efficiency.
For consumers, SEER2 ensures:
Better long-term energy savings
Improved comfort through more accurate performance expectations
Compliance with modern federal efficiency regulations
In short:
SEER = old efficiency measurement (ideal lab conditions)
SEER2 = modern, realistic efficiency standard (real-world performance)
Better quality = SEER2 units are designed and tested to give actual efficiency and savings, not just theoretical numbers.
Understanding EER vs EER2
What is EER?
EER stands for Energy Efficiency Ratio. It measures an air conditioner or heat pump’s efficiency at a single, specific outdoor temperature, usually 95°F.
Higher EER = more efficient at peak conditions.
Unlike SEER, which averages efficiency over a season, EER tells you how the unit performs under hot, steady-state conditions.
Example: A unit with an EER of 12 produces 12 BTUs of cooling for every watt of electricity consumed.
What is EER2?
EER2 is the updated testing standard introduced by the Department of Energy (DOE) to match the same real-world adjustments as SEER2.
Accounts for modern system designs, refrigerants, and installation configurations.
Measures efficiency more realistically under peak operating conditions, rather than just ideal lab setups.
Like SEER2, EER2 numbers are usually slightly lower than traditional EER, but they are a more accurate reflection of actual performance.
Why EER2 is the new standard
Ensures consistency with SEER2 testing methodology.
Reflects true cooling efficiency under extreme heat, where peak performance matters most.
Helps consumers understand real-world energy use and savings potential during the hottest days.
Meets modern federal efficiency regulations and encourages manufacturers to improve performance under actual conditions.
In short:
EER = old standard, measured under lab conditions at 95°F
EER2 = modern standard, measured under realistic, real-world peak conditions
Better quality = EER2 gives you true peak efficiency, not just theoretical performance.
