Lennox XC21 Specifications


Air conditioner, heater and HVAC manufacturer Lennox positions its XC21 model air conditioner as a quiet and energy-efficient machine. This residential unit comes in a few different varieties – models XC21-024, 036, 048 and 060 – that vary in energy consumption and sound output. As part of the company's Signature collection of air conditioners, the XC21 is one of Lennox's top models, both in operation and in price. Specifications may vary as Lennox's product line evolves.

Operating Specifications

  • Lennox's model 024 XC21 air conditioner features a SEER – or Seasonal Energy Efficiency Ratio – rating of up to 21.00 while the 036 model has a rating of up to 20.00. Model number 048 has a SEER rating of up to 18.20 and 060 of up to 16.50. The Signature Collection XC21 024 outputs 69 decibels of noise, just about 10 decibels more than the average conversational voice, while the 036 runs at 71 decibels. Both 048 and 060 models output 73 decibels. All variations of the air conditioner rely on a high-efficiency outdoor coil for heat transfer and low air resistence.


  • SilentComfort technology, including a custom fan grille, and an insulated compressor compartment aid in noise suppression while a direct-drive fan provides cooling. This air conditioner features Humiditrol, a whole-home dehumidification system, and all variations of the Lennox Signature Collection XC21 feature touchscreen thermostats. The Environmental Protection Agency gives these air conditioners the Energy Star seal of approval for energy efficiency. Users can add solar modules to the XC21, as the unit features SunSource solar-ready options.

Physical Specifications

  • The Lennox XC21 has a textured steel cabinet, pre-painted in black and charcoal gray colors. The unit features a louvered design for quick access to its operating components. A rounded top sports the Lennox logo while the sides of the machine feature vented construction. The air conditioner measures 47 inches high, 35.5 inches wide and 39.5 inches deep. All Lennox XC21s are the same size.

Pricing and Availability

  • Only specialty air conditioning and HVAC dealers offer the Lennox Signature Collection XC21. Compared to the manufacturer's other residential air conditioners – such as Elite or Merit series – the Signature XC21 ranks as one of Lennox's most expensive models. The company's website has a “find a dealer” feature to help customers locate the nearest Lennox dealer. As of 2011, dealers quote the XC21 at about $6,500 to $7,000 dollars, though pricing may vary per dealer and XC21 model.

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