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| Attribute | Details |
|---|---|
| Make | Lennox |
| Series | Merit Series |
| Model | ML14KP1-042-230 / ML17XP1-042 |
| Capacity | 3.5 Ton |
| Cooling Capacity | 42,000 BTU |
| Product Type | Split System Heat Pump |
| Compressor Type | Scroll Compressor |
| Compressor Stage | Single Stage |
| Energy Efficiency | Up to 14.3 SEER2 |
| Heating Efficiency | ≥ 7.5 HSPF2 |
| Refrigerant Type | R-454B / R-410A |
| Installation Type | Split System |
| Application | Residential |
| Operation | Heating & Cooling |
| Voltage | 208–230V, 1 Phase |
| Noise Level | Approx. 74 dB |
| Coil Type | Quantum™ Coil |
| Build Quality | Weather-Resistant Steel Cabinet |
| Suitable For | Medium to Large Spaces |
| Usage Areas | Homes, Living Areas |
| Warranty | 5–10 Years Parts (Registration Required) |
The Lennox Merit Series 3.5 Ton Heat Pump System is a dependable and energy-efficient solution designed for residential heating and cooling. With a 3.5 ton (42,000 BTU) capacity, this system is ideal for medium to large homes, delivering consistent and reliable comfort throughout the year.
Built with Lennox’s proven engineering, the Merit Series features a durable single-stage scroll compressor that ensures stable and efficient operation. It provides effective cooling during hot weather and dependable heating during cooler seasons, making it a practical all-in-one HVAC solution.
This system is equipped with Lennox’s Quantum™ coil technology, designed to enhance durability and resist corrosion, even in demanding outdoor environments. It uses next-generation R-454B refrigerant, offering improved environmental performance and compliance with modern HVAC standards.
With efficiency ratings of up to 14.3 SEER2 and ENERGY STAR® eligibility, the unit helps reduce energy consumption while maintaining strong performance. The rugged, weather-resistant steel cabinet and quiet operation make it a reliable choice for long-term residential use.
Key Features
Efficient Cooling & Heating – 3.5 Ton Capacity
Ideal for medium to large homes with consistent performance.
Single-Stage Operation
Reliable and straightforward operation with steady output.
Scroll Compressor
Durable and efficient compressor for long-term reliability.
Up to 14.3 SEER2 Efficiency
Energy-efficient performance with potential ENERGY STAR® qualification.
Quantum™ Coil Technology
Enhanced corrosion resistance and durability.
R-454B Refrigerant (Next-Gen)
Lower environmental impact and future-ready compliance.
Durable Steel Cabinet
Weather-resistant construction for outdoor longevity.
Quiet Operation
Designed for low noise levels to improve indoor comfort.
Why Buy Lennox Merit Series 3.5 Ton Heat Pump
The Lennox Merit Series 3.5 Ton heat pump is an excellent choice for homeowners seeking a reliable, cost-effective, and efficient HVAC system for larger spaces. With durable components and consistent performance, it offers strong long-term value.
Customer Reviews
12 reviews for Lennox 3.5 Ton Merit Series Heat Pump
Why Homeowners Trust Jimmy HVAC for Reliable Comfort
Reliable HVAC Solutions Built for Comfort, Efficiency, and Long-Term Peace of Mind.
Financing Options Available
Enjoy peace of mind with low monthly payments that make your costs easy to manage without compromising on quality.
Transparent, Upfront Pricing
No hidden charges—just honest, clear pricing so you always know exactly what to expect before work begins.
Free Installation Included
Enjoy hassle-free setup with free professional installation completed on every purchase.
Licensed & Certified Technicians
TSSA-licensed experts ensure safe, highly reliable, and precise system installations and diagnostic repairs.
Parts & Labour Warranty
Long-lasting protection with comprehensive parts coverage alongside our trusted, comprehensive labor guarantees.
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Professional HVAC Installation & Replacement
Jimmy HVAC provides professional installation, replacement, and system upgrades for residential and light commercial HVAC equipment throughout the Greater Toronto Area. Our certified technicians ensure every system is installed according to manufacturer specifications, Ontario building codes, and industry best practices.
Whether you are upgrading to a high-efficiency system, replacing ageing equipment, or installing a new HVAC solution, our team serves homeowners and property managers across the GTA with reliable service and transparent pricing.
Full-Service HVAC Solutions
- Furnace installation & replacement
- Air conditioner installation
- Heat pump systems
- Tankless water heaters
- Boiler systems
- HVAC system upgrades & retrofits
- Complete Commercial HVAC Solutions
- Preventative maintenance & system inspections
Laura Bennett –
Overall a good experience. The Lennox Merit Series unit performs well, though the initial scheduling took a bit of follow-up.
Kevin Patel –
Jimmy HVAC gave us a clear breakdown of costs and no surprises later. The heat pump has been working great since installation.
Nicole Fraser –
Decent system for the price. Not the most advanced features, but reliable for everyday use.
Harpreet Dhillon –
We chose the Lennox 3.5 Ton Merit Series Heat Pump after comparing options. It’s energy efficient and keeps the house comfortable.
Brandon Clarke –
Very fast service from Jimmy HVAC. From quote to installation, everything was done within a few days.
Sophie Tremblay –
The unit works fine, but I wish it was a bit quieter at higher settings. Still does the job well.
Amandeep Gill –
Installation team from Jimmy HVAC was professional and respectful. They cleaned up after the job, which I appreciated.
Ryan O’Connor –
The Lennox Merit Series heat pump has been reliable so far. Heating and cooling both work smoothly.
Melissa Chen –
Happy with the purchase. Jimmy HVAC offered fair pricing compared to other quotes we got.
Derek Thompson –
Good performance overall. Took a little longer than expected to install, but the system itself works great.
Priya Kaur Sandhu –
We recently upgraded to the Lennox 3.5 Ton Merit Series Heat Pump through Jimmy HVAC. Cooling is consistent and the system runs quieter than expected. The team explained everything clearly.
Jason McAllister –
The Lennox 3.5 Ton Merit Series Heat Pump works well for our home. Installation by Jimmy HVAC was quick and clean.