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- 3.5 ton - best for spaces between 1700- 2100 sq ft depending on your home's insulation and your climate
- SEER2 rating helps consumers compare energy efficiency when choosing a new air conditioner. Higher SEER2 ratings mean significant utility savings. The federal minimum is 14 SEER2 with ratings into the 20 SEER2 range. A 20 SEER2 uses half the energy of a 10 seer much like MPG ratings for vehicles.
- Heat pumps are all electric and good for mild and cold climates.
- If you have an indoor furnace, or air handler, along with an outdoor AC unit, this system will serve as a replacement for both.
Lennox Merit 3.5 Ton 14.3 SEER2 Heat Pump System - R454B
- Condenser: ML14KP1-042-230
- Air Handler: CBK45UHPT-042
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- 3.5 ton - best for spaces between 1700- 2100 sq ft depending on your home's insulation and your climate
- SEER2 rating helps consumers compare energy efficiency when choosing a new air conditioner. Higher SEER2 ratings mean significant utility savings. The federal minimum is 14 SEER2 with ratings into the 20 SEER2 range. A 20 SEER2 uses half the energy of a 10 seer much like MPG ratings for vehicles.
- Heat pumps are all electric and good for mild and cold climates.
- If you have an indoor furnace, or air handler, along with an outdoor AC unit, this system will serve as a replacement for both.
Lennox Merit 3.5 Ton Split System Heat Pump Condenser - Up to 17 SEER2, R454B
Model Number
ML14KP1-042-230
Dimensions
32-1/4" W x 32-1/4" D x 37-1/4" H
Documents
ML14KP1-042-230 Specifications
Warranty
Parts: 5 years
Lennox Merit 3.5 Ton Upflow/Horizontal Air Handler - Quantum Coil, Factory-Installed TXV, R454B
Model Number
CBK45UHPT-042
Dimensions
21-1/2" W x 22" D x 53-5/8" H
Documents
Warranty
Parts: 5 years
Heat Kit Options
AHRI Number
215739991
Efficient Heating and Cooling with Proven Lennox Engineering
The Lennox Merit ML14KP1-042-230 3.5 Ton Heat Pump Condenser combines dependable single-stage operation with durable Lennox engineering. Designed to provide both heating and cooling, this Merit® Series outdoor unit offers homeowners a practical solution for year-round indoor comfort.
The ML14KP1-042-230 provides 3.5 tons of nominal capacity and is part of a heat pump family capable of achieving efficiency ratings of up to 17 SEER2 and 8.2 HSPF2, depending on the matched indoor equipment.
Key Features
- 3.5 Ton Heat Pump – Provides heating and cooling from one outdoor system.
- Up to 17 SEER2 / 8.2 HSPF2 – Efficient performance with qualifying equipment combinations.
- R-454B Refrigerant – Lower-GWP refrigerant with zero ozone depletion potential.
- Single-Stage Scroll Compressor – Consistent and dependable heating and cooling.
- Factory-Installed Crankcase Heater – Supports proper compressor lubrication.
- Quantum™ Coil – Aluminum construction engineered for corrosion resistance.
- Heavy-Gauge Cabinet – Durable construction helps protect the outdoor equipment.
Corrosion-Resistant Quantum™ Coil
The Lennox Quantum™ Coil features aluminum alloy tubing and fins designed for strong corrosion resistance. Its construction provides extensive fin surface exposure and contact area for effective heat transfer, and Lennox factory tests the coil under high pressure.
Simple, Dependable Single-Stage Operation
A single-stage scroll compressor delivers consistent heating and cooling without the complexity of variable-capacity operation. The compressor is engineered for efficient refrigerant flow and quiet operation, with a discharge-line muffler and vibration-isolating mounts helping reduce operating noise.
Designed for R-454B Systems
R-454B provides lower global warming potential and zero ozone depletion potential. Because R-454B is an A2L refrigerant, the complete system requires compatible indoor equipment with an approved refrigerant detection and mitigation system.
Built for Outdoor Conditions
The ML14KP1 is protected by a heavy-gauge steel cabinet with louvered panels and a powder-painted finish. A zinc-coated base adds resistance against rust and corrosion, helping provide the durability expected from Lennox outdoor equipment.
Choose the Lennox ML14KP1-042-230 for dependable 3.5-ton heating and cooling. Combine it with properly matched Lennox indoor equipment to create an efficient home comfort system.
Flexible Performance for Consistent Indoor Comfort
Move conditioned air throughout your home with the Lennox Merit CBK45UHPT-042 3.5 Ton Air Handler. Designed for compatible R-454B split systems, this versatile indoor unit features upflow and horizontal installation capability, a multi-speed blower motor, and Lennox's corrosion-resistant Quantum™ Coil.
The CBK45UHPT-042 provides a nominal 3.5-ton capacity. Its factory-installed expansion valve, refrigerant detection components, and flexible cabinet configuration make it a practical indoor match for qualifying Lennox air conditioners and heat pumps.
Key Features
- 3.5 Ton Air Handler – Provides indoor airflow for compatible residential HVAC systems.
- Flexible Installation – Supports upflow and horizontal equipment configurations.
- Quantum™ Coil – Corrosion-resistant aluminum construction promotes dependable heat transfer.
- Factory-Installed TXV – Helps maintain properly controlled refrigerant flow.
- Multi-Speed PSC Blower – Offers a selection of airflow settings for system setup.
- Factory-Installed R-454B Detection System – Monitors for refrigerant and initiates mitigation when necessary.
- Low-Leakage Cabinet – Meets established air-tightness requirements with less than 2% cabinet air leakage.
Corrosion-Resistant Indoor Coil
Lennox manufactures the Quantum™ Coil using enhanced aluminum alloy tubing and fins. This construction provides superior resistance to corrosion while its A-shaped design offers a large surface area for effective heat transfer and low resistance to indoor airflow.
Selectable Blower Speeds
The multi-speed PSC blower motor gives the installer a choice of airflow settings to support the needs of the matched HVAC system. Its straightforward design provides dependable operation, and the blower assembly can be removed from the cabinet for servicing.
Prepared for R-454B Operation
The CBK45UHPT-042 is equipped with a factory-installed R-454B check and expansion valve. Its integrated refrigerant detection system monitors the indoor unit and can interrupt heating or compressor demand while operating the blower to help reduce refrigerant concentration.
Built for Flexible Indoor Installation
The insulated galvanized steel cabinet ships ready for upflow or horizontal right-hand discharge. It can be converted for horizontal left-hand airflow by repositioning the drain pan, and an optional kit allows conversion to downflow operation when required.
Complete your compatible 3.5-ton system with the Lennox Merit CBK45UHPT-042 and enjoy reliable airflow, adaptable installation, and durable Lennox coil technology.
Optional Electric Heat for Added Cold-Weather Comfort
Customize your Lennox heat pump system with an optional electric heat kit for additional heating support when outdoor temperatures drop. Installed inside the compatible Lennox CBK45 Series air handler, the heat kit provides electric resistance heat that works with the air handler's blower to distribute warm air through your home's existing duct system.
Available heat-kit capacities vary by the selected system and air handler, allowing the equipment to be matched to the home's heating requirements and available electrical service. Compatible configurations may be available with or without factory-mounted circuit breakers.
Electric Heat Kit Benefits
- Supplemental Heating – Adds an additional source of heat when the heat pump requires assistance during colder weather.
- Multiple Heating Capacities – Select systems are available with electric heat options ranging from 4 kW to 15 kW, depending on equipment compatibility.
- 208-230V Single-Phase Operation – Designed for compatible residential electrical applications.
- Responsive Heat Transfer – Helix-wound nichrome heating elements are positioned directly in the airflow to efficiently transfer heat into the moving air.
- Built-In Temperature Protection – Limit controls help protect the heating elements against excessive operating temperatures.
- Factory-Assembled Controls – Heat-kit controls and components are assembled and wired for installation inside the compatible air handler.
- Breaker and Non-Breaker Options – Depending on the selected capacity and system configuration, heat kits may be available with factory-mounted circuit protection or a terminal-block connection.
Choose the Right Heat Kit for Your Home
The correct electric heat kit should not be selected by system tonnage alone. Heating requirements, air-handler compatibility, airflow, supply voltage, available electrical service, wire sizing, circuit protection, and local electrical-code requirements should all be considered when selecting an electric heat option.
Select an available electric heat kit when configuring your system to add dependable supplemental heating for colder conditions. Final equipment compatibility and electrical requirements must be verified by a qualified HVAC or electrical professional.
Who installs the AC unit after I purchase it?
ACDirect does not yet provide installation services directly. However, most of our customers successfully arrange installation through local licensed HVAC contractors. These systems are designed for professional installation and typically include the components your installer will need.
Here’s how it works:
- Hire a licensed HVAC technician in your area
- Use platforms like Angi, Thumbtack, or a local HVAC directory to find reliable professionals
- Confirm your installer is experienced with the system type you’re purchasing
Note:
Please be aware if you choose to install HVAC equipment yourself and don’t possess proper HVAC licensing, you will void the manufacturer’s factory warranty. If you are capable of a factory-compliant installation yourself, you will need a licensed HVAC contractor to sign off on your work, fully confirming factory-compliant workmanship.
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