Lennox DLSC SL18XP1-042-230, 3.5 Ton, Up to 16.50 SEER, Up To 10.2 HSPF, 208-230 VAC 1 Ph 60 Hz Heat Pump with SilentComfort Technology

Cat # : 12U10

Model/Part # : SL18XP1-042-230


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Catalog Number
Model/Part Number
Minimum Order Quantity
Base Unit of Measure
Product Voltage
208-230 VAC 1 Ph 60 Hz
Cooling Capacity
3.5 Ton
Product Depth
39.5 Inch
Product Width
35.5 Inch
Product Height
41 Inch
Compressor Stages
1 Stage
Heat Pump with SilentComfort Technology
Up To 10.2 HSPF
Gross Weight
300 lbs.
Suction Line OD
7/8 Inch
Liquid Line OD
3/8 Inch
Energy Star Certified
Up to 16.50 SEER
Refrigerant Type

Product Overview

Dave Lennox Signature® Collection

SL18XP1 Heat Pump

The quietest and most efficient single-stage heat pump*

As the latest addition to the Dave Lennox Signature® Collection, the SL18XP1-042-230 offers efficiencies up to 18.50 SEER and 10.20 HSPF, with sound levels as low as 67 decibels.

Signature® Performance & Comfort

  • The quietest single-stage heat pump on the market: as low as 67 decibels! Approximately 40 times quieter than a standard heat pump*
  • Scroll compressor helps precisely control air temperature for greater comfort
  • The SL18XP1 system paired with an iComfort® S30 thermostat monitors humidity levels and removes excessive moisture that can cause mold growth, creating healthier, more comfortable air
  • Compatible with the exclusive Healthy Climate® ozone-free Indoor Air Quality Solutions system
  • SunSource® solar-ready design – maximizes energy savings by integrating the unit with one to sixteen solar modules

Reliability & Performance

  • The Lennox Quantum™ Condenser Coil can help protect against corrosion in harsh environments, including coastal areas
  • All-aluminum fortified tube and fin construction provides efficient heat transfer, lighter weight, and ease of cleaning
  • Durable single stage scroll compressor
  • 10-year limited warranty on compressor and covered components

Easier Handling & Cleaning

  • Lighter weight for easier (and safer) handling
  • Water-only cleaning: no coil cleaner purchase
  • Water-only cleaning appeals to the environmentally-conscious consumer
  • Lennox provides complimentary training for this new cleaning system

Energy Efficiency

  • The most efficient single-stage heat pump*
  • Up to 18.50 SEER and 10.20 HSPF efficiency ratings
  • Unit may qualify for many state utility rebates
  • ENERGY STAR® qualified
  • Dual-fuel option pairs the SL18XP1 with a Lennox communicating gas furnace. The SL18XP1 provides warmth as temperatures drop. On extremely cold days, the gas furnace takes over to maintain maximum comfort

*Actual system efficiency may vary depending on the exact system match. Efficiencies are representative of a single AHRI Most Popular matched combination. Always verify actual system efficiencies through AHRI or by visiting AHRI ratings database at Must be accompanied by either a Lennox variable speed air handler or furnace and an iComfort® communicating thermostat.

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