Lennox Dave Lennox Signature Collection SL28XCV Review

The Lennox Signature Collection SL28XCV is the crown jewel of Lennox’s lineup — the brand’s most advanced and energy-efficient air conditioner to date. With a variable-speed compressor and a record-breaking SEER of 28, it stands as the most efficient residential air conditioner on the market.

However, such high-end performance comes with a premium price tag. This review breaks down the SL28XCV’s features, efficiency, pricing, warranty, and how it compares to other Lennox models — so you can decide if this elite system is the right fit for your home.

💡 In a Nutshell

Average Price (with Installation): $5,000 – $7,500+

Top Features

Most energy-efficient air conditioner available (up to 28 SEER)
ENERGY STAR® Most Efficient 2022 award winner
Variable-speed inverter compressor for ultra-precise cooling control
Part of the Ultimate Comfort System — integrates with Lennox’s top-tier heating, cooling, and air purification devices
Extremely quiet operation (as low as 56 dB)
Quantum™ Coil made from Lennox’s proprietary aluminum alloy for superior corrosion resistance
Precise Comfort® technology adjusts system output in minute increments
Compatible with the iComfort® S30 ultra smart thermostat for advanced automation and monitoring

🧊 The Bottom Line

The SL28XCV delivers unmatched efficiency and precision. Its variable-speed compressor runs almost continuously at low speeds, maintaining steady, whisper-quiet comfort while consuming minimal energy.

This technology ensures:

Consistent indoor temperatures (no hot or cold spots)
Exceptional humidity control
Long-term energy savings

That said, a 28 SEER system is more power than most Canadian homeowners need. In Canada’s moderate summer climate, an air conditioner with a SEER between 16 and 18 typically offers the best value. While the SL28XCV guarantees elite performance, its higher upfront cost may outweigh the potential energy savings in cooler regions.

🔍 In-Depth Review

Product Specifications

Compressor: Variable-speed inverter
SEER Rating: Up to 28
ENERGY STAR® Certified: Yes
Sound Level: As low as 56 dB

⚙️ Features Overview

The SL28XCV is engineered for superior comfort and durability. Its variable-speed compressor not only minimizes temperature swings but also allows the system to operate almost silently — aided by sound-dampening insulation and precision balancing.

The model also includes Lennox’s Quantum™ Coil, constructed from a durable aluminum alloy proven to resist corrosion and withstand extreme outdoor conditions.

Additionally, this unit integrates seamlessly with Lennox’s Ultimate Comfort System, pairing with devices such as:

Variable-speed gas furnaces or air handlers
Air purifiers
Smart zoning systems
iComfort® S30 smart thermostat

Together, these components deliver whole-home comfort and intelligent temperature management year-round.

🌡️ Smart Thermostat Integration

When connected to the iComfort® S30 ultra smart thermostat, the SL28XCV unlocks advanced smart features like:

Geofencing – adjusts cooling based on your location
System diagnostics and remote troubleshooting
Air quality and pollen level response – automatically adjusts to maintain cleaner indoor air
Remote control and scheduling via mobile app

🧰 Additional Highlights

Precise Comfort® technology maintains stable temperature and humidity levels
Ultra-quiet performance even during peak operation
Durable PermaGuard™ cabinet for long-lasting protection
Easy access for service and maintenance

🛡️ Warranty Information

The SL28XCV comes with a 10-year limited parts warranty, which includes the compressor.
To access full coverage, registration is required within 60 days of installation (either online or by phone). Unregistered units are limited to 5-year parts coverage.

Lennox also offers a flexible warranty option: during registration, you can exchange part of your parts warranty for a labor warranty, offering extra protection for service costs — a feature rarely provided by other manufacturers.

🔄 Comparable Lennox Models

1. SL28XCV vs. Merit ML14XC1

The ML14XC1 is an entry-level model with a single-stage compressor and a 17 SEER rating. It’s ENERGY STAR® certified and much more affordable ($3,500–$5,000 installed), but it lacks the quiet, precise control and efficiency of the SL28XCV.
While the ML14XC1 features the same Quantum™ Coil, it’s not compatible with Lennox’s smart thermostat and doesn’t provide advanced humidity control.

2. SL28XCV vs. Elite XC20

The Elite XC20 sits in Lennox’s mid-range lineup and may be a more practical choice for many Canadian homes.
It features a variable-speed compressor, SEER up to 20, and ENERGY STAR® certification — providing many of the same comfort and efficiency benefits as the SL28XCV, but at a lower cost.
Both units were awarded ENERGY STAR’s Most Efficient 2022, and both operate quietly, making the XC20 an excellent cost-effective alternative.

3. SL28XCV vs. Signature XC21

The XC21, another premium-tier model, uses a two-stage compressor rather than variable-speed technology.
It offers a 21 SEER rating, ENERGY STAR® certification, and compatibility with Lennox smart thermostats — but it lacks the Quantum™ Coil and the precision modulation of the SL28XCV.
While both promise quiet, efficient performance, the SL28XCV remains superior in energy savings and comfort control.

🏁 Final Verdict

The Lennox SL28XCV is the pinnacle of home cooling technology, offering the highest efficiency, ultra-quiet operation, and precise temperature control.

However, its premium cost and extreme SEER rating make it best suited for:

Homeowners in hot climates
Those seeking maximum energy efficiency and quiet performance
Smart home enthusiasts who want full system connectivity

For most Canadian households, a slightly less powerful model — like the EL18XCV or XC20 — will deliver nearly identical comfort and efficiency at a more practical price point.