Lennox XC21 Central Air Conditioners | FurnaceCompare®

Lennox XC21 Air Conditioner Overview

The Lennox XC21 air conditioner is part of the Dave Lennox Signature Collection. It is Energy Star qualified and bears the Good Housekeeping seal of approval. It is rated for up to 20.5 SEER, which the Lennox company says can save up to $1500 in utility bills in five years when compared to a 10.0 SEER air conditioning unit. Buyers of the XC21 may qualify for a federal tax credit. The unit is equipped with a low-sound fan and a two-stage scroll compressor, which Lennox says is on a low setting the majority of the time, reducing power usage.

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Consumer Reviews of Lennox XC21


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #3 of 22 Lennox Air Conditioner
  • 57.14% of customers recommended

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Lennox XC21 Air Conditioner Reviews

Showing 11-15 of 18 reviews

"Great System"

5.0 rating
Very Satisfied

I love how quiet my new a/c system is. My old Trane system was so noisy that I couldn't even sit on my back porch when it was running. Not to mention my electric bills are half of what they were before. Great system, and I can't wait to replace my main level system.

Joey M.

Atlanta, GA

"Intelligent does not apply to designers of this"

2.0 rating
Somewhat Unsatisfied

Bought communicating furnace/AC/thermostat combo. Very efficient stuff, but… Thermostat display panel throws off enough heat to throw off a/c temperature-over cools by 3-4 degrees @70 degree setting. Solution is to shutoff display and have it only on when you touch it! You think they would know enough to move the temperature sensor away from the lightbulb! Unit lasted through one cooling season without breaking. Start of second cooling season-did not cool. "Intelligent" circuitry did not give any error messages–unit just thinks its running. Since warantee not cover labor, rang up $450 to replace outdoor fan motor. So far not know long run reliability, but starting off pretty poorly.

P Tal

Philadelphia, PA

"Super Silent Air Conditioner!"

5.0 rating
Very Satisfied

I am very happy with my central air conditioner. My central air conditioner is the Dave Lennox XC21 air conditioner. I bought this air conditioner about 6 months ago, after my old one broke down. I was worried that it wouldn't get fixed, but then I found the XC21 air conditioner, and I bought that spontaneously. I am extremely happy with its performance thus far. I like that this is a very quiet air conditioner. I barely know it is there. It is a very nice finish too. I dislike that this air conditioner costed so much money, but I guess, in the end, it will be worth it. I have not had to repair my air conditioner or replace it thus far. I hope I never will have to either. I would recommend this to a friend, and I would most definitely buy the same brand again. It is so great and I can't wait to recommend it to everyone!

Bay Shore, NY


4.0 rating
Somewhat Satisfied

Lennox is a well known trusted brand and I have owned this air conditioner for almost two years. I like that it runs smoothly but I don't like that I can hear it so vividly and I expected it to be almost silent, from the way the company advertised it on the box. I don't like loud machines, especially when my two year old is napping. But on the other hand, I have not had to repair or replace it yet. I would buy the same brand again and recommend it to a friend because its inexpensive and worth the cost. This machine puts out very cool air; the air is almost colder than the one in my freezer.

Lake City, SC

"Air Conditioner Review"

5.0 rating
Very Satisfied

I have owned my air conditioner for about 5 years and I believe that the Lennox XC21 is a very high quality air conditioner. I like that it is 13 times quieter then standard air conditioners. It has noise reduction technology that enhances this advantage. I am very statisfied with my product, there is nothing I dislike about this product. I never had to repair my air conditioner throughout the whole five years I've used it. I would definitely recommend this brand over any other leading brand to my friends.

New York, NY

Other XC21 Reviews

Online posters have mostly positive things to say about the XC21, especially its high SEER. However, one poster in this online forum thread says the unit was not as efficient as he had hoped. Other posters attribute this to the model being a large one.

One poster in this thread says the XC21 appears to be a good value for its high SEER rating.

Lennox XC21 Model Numbers

The XC21 is available in different models which vary in efficiency and capacity.

Model Number SEER BTUs per Hour
XC21-024 21 24,000
XC21-036 21 36,000
XC21-048 18.2 48,000
XC21-060 16.5 60,000

XC21 Warranty

Lennox covers the XC21 with a 10-year limited warranty on the compressor and all other parts.

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