2.5 Ton Merit Single Stage System – Reliable, Efficient Home Comfort
Upgrade your home with the 2.5 Ton Merit Single-Stage System, a complete HVAC bundle featuring the ML14KC1 air conditioner, ML180E furnace, and CK40HT-71 horizontal evaporator coil. With a SEER2 of 16.5 and EER2 of 13.8, it delivers efficient, quiet cooling and heating while meeting 2025 refrigerant standards.
This system is perfect for homeowners seeking dependable comfort and energy savings. Plus, its durable components, braze-free installation, and built-in Refrigerant Detection System make setup and maintenance easier. For those wanting ultra-efficient performance, our Elite multi-stage systems offer next-level comfort and savings.
✅ Powerful 2.5 Ton heating and cooling ✅ Energy-efficient SEER2 16.5 / EER2 13.8 ✅ Quiet, durable, and low-maintenance ✅ Complete HVAC bundle with free installation options
2.5 Ton Merit Single-Stage System – Complete Home Comfort Made Easy
Transform your home’s heating and cooling with the 2.5 Ton Merit Single-Stage System. This all-in-one bundle includes the ML14KC1 air conditioner, ML180E gas furnace, and CK40HT-71 horizontal evaporator coil, creating a seamless central air conditioning system for year-round comfort. Together, these components provide efficient, reliable, and future-ready climate control.
SEER2: 15.5
EER2: 13
With a SEER2 of 16.5 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-71
The CK40HT-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 2.5 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 near me or installing a new air conditioning systems setup, this system delivers reliability, efficiency, and peace of mind.
Key Benefits at a Glance: ✅ Powerful 2.5 Ton single-stage cooling and heating ✅ SEER2 16.5 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 #: ML14KC1-030
Product Overview
Merit® Series | ML14KC1 Air Conditioner – Standard-Efficiency Cooling for Your Home
The Lennox® Merit® Series ML14KC1 air conditioning system is designed to deliver consistent cooling, dependable performance, and long-lasting comfort. Built with a single-stage compressor and future-ready refrigerant compatibility, this HVAC unit meets 2025 EPA standards while keeping energy costs low. As a result, homeowners get a balance of comfort, efficiency, and environmental responsibility.
Energy Efficiency & Cooling Performance
The ML14KC1 provides reliable cooling performance with a 14.30 SEER2 efficiency rating. In addition, it is ENERGY STAR® Certified, meaning it exceeds federal guidelines for energy-efficient HVAC systems.
This model is also eligible for Federal Tax Credits under the Energy Efficient Home Improvement Credit (IRC Section 25C). Its high-efficiency outdoor coil improves heat transfer and reduces air resistance, ensuring dependable airflow and smoother operation. Furthermore, the single-stage compressor runs at full capacity when needed, delivering steady comfort even on the hottest days.
Quiet & Comfortable Operation
Unlike older air conditioning units, the ML14KC1 is built for quiet cooling. It operates at sound levels as low as 73 dB, helping create a more peaceful home environment. In addition, the precision-balanced, direct-drive outdoor fan reduces noise, minimizes vibrations, and extends product life.
Craftsmanship & Reliability
Every part of this home air conditioner is designed for strength and durability. The Quantum™ Coil is made from a tested aluminum alloy that resists harsh weather. Plus, the heavy-gauge, galvanized steel cabinet includes a louver coil guard, zinc-coated base, and baked-on powder finish to protect against rust and corrosion.
Installation is simplified with braze-free connections that support 2025 compliant refrigerants. In addition, built-in drainage holes prevent moisture buildup and extend system life.
Safety & Sustainability
This unit uses R-454B refrigerant, which meets EPA requirements for low-GWP refrigerants. For added protection, the Refrigerant Detection System (RDS) ensures A2L safety compliance. If a leak is detected, the system automatically halts operation and activates the blower fan to safely disperse refrigerant.
Complete Comfort System Option
For maximum efficiency, pair the ML14KC1 with a compatible Lennox® furnace and evaporator coil. This creates a complete HVAC system that delivers year-round comfort with reliable heating and cooling.
Key Benefits at a Glance
✅ 14.30 SEER2 efficiency rating for dependable cooling ✅ ENERGY STAR® Certified and federal tax credit eligible ✅ Quantum™ Coil engineered for durability and harsh weather conditions ✅ Quiet cooling operation with sound levels as low as 73 dB ✅ Flexible braze-free installation for 2025 compliant refrigerants ✅ Built-in Refrigerant Detection System for enhanced safety ✅ Bundle option available with furnace and coil for complete HVAC performance
Product Specifications:
Brand
Lennox
Catalog Number
25C88
Model/Part Number
ML14KC1-030-230
Base Unit of Measure
Unit(S)
Family
ML14KC1
Series
Merit
Type
Single-Stage Air Conditioner
Nominal Cooling Capacity
2.5 Ton
Product Voltage
208-230 VAC 1 Ph 60Hz
Product Width
28.7 Inch
Product Height
29.1 Inch
Compressor Type
1 Stage
Number of Compressors
1 Compressor
SEER2
Meets or exceeds 14.30 SEER2
Gross Weight
180.0 Lbs
Liquid Line OD
3/8 Inch
Suction Line OD
3/4 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 Lennox® Merit® Series CK40HT-71 evaporator coil is engineered for reliable, efficient performance in residential and light commercial HVAC systems. Built specifically for R-454B refrigerant, this full-cased, horizontal coil is designed for use with Lennox® air conditioners and heat pumps. Factory-installed with a thermostatic expansion valve (TXV) and a Refrigerant Detection System (RDS) sensor, it ensures both energy efficiency and enhanced safety while meeting upcoming 2025 EPA refrigerant compliance standards.
Energy Efficiency & Performance
R-454B refrigerant ready for improved efficiency and compliance with low-GWP requirements.
Available in 1.5- to 5-ton capacities, supporting a wide range of applications.
Factory-installed TXV optimizes refrigerant flow for consistent cooling performance.
Large coil surface area improves heat transfer, enhancing air conditioning performance.
Minimal air resistance design allows smoother, more efficient system operation.
Quiet & Comfortable Operation
Horizontal design provides flexible installation in multiple spaces.
Consistent, efficient airflow reduces strain on the air conditioner or heat pump while helping maintain quieter operation.
Craftsmanship & Reliability
RDS sensor detects leaks and communicates with blower mitigation controls to initiate a flush sequence for safe operation.
Braze-free installation option simplifies setup and increases flexibility.
Rifled aluminum tubing and sleeved distributor tubes improve durability and system longevity.
Non-corrosive, UV-resistant polymer drain pan with dual connections resists wear and prevents leaks.
Enhanced gasketing design provides added protection against moisture intrusion.
Safety & Sustainability
Fully compliant with 2025 EPA standards for lower-GWP refrigerants.
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.
