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CBX40UHV Variable Speed Air Handler

Dave Lennox Signature® Collection

CBX40UHV Variable Speed Air Handler

The quietest and most efficient air handler you can buy5

Using innovative variable speed technology, the CBX40UHV provides a continuous flow of air, which helps reduce drafts, sound levels and energy costs. A built-in filtration system gives you the advantage of powerful allergen control.


Here are some of the top features of the CBX40UHV:

More-efficient operation reduces electric consumption and conserves resources.

Variable speed blower motor allows enhanced humidity control, improved air quality and more consistent temperature for added comfort.

Factory-installed MERV 16 Precision Pleat™ media filter provides healthier indoor air.

SilentComfort™ technology delivers the ultimate in quiet, consistent cooling and heating.


Features and Benefits

Energy Efficiency

  • Offers greater cooling efficiency when matched with specific air conditioners or heat pumps
  • More-efficient operation—reduces electric consumption and conserves resources
  • iComfort®-enabled technology—allows the air handler, when installed with the easy-to-use programmable iComfort WiFi® Touchscreen Thermostat, to exchange information and make adjustments as needed to optimize performance and efficiency*

Quiet Operation

  • SilentComfort™ technology—delivers the ultimate in quiet, consistent cooling and heating
  • Variable speed blower motor—allows enhanced humidity control, improved air quality and more consistent temperature for added comfort

Home Comfort

  • Variable speed blower motor—allows superior ramp-up control in heating mode, eliminating uncomfortable bursts of cold air
  • High-static capability—adjusts airflow to meet the comfort requirements of your home
  • Factory-installed MERV 16 Precision Pleat™ media filter—provides healthier indoor air and reduces the space required for installation
  • Improved humidity control
  • Staged electric heat strips—provide just the right amount of heat

Environmental Responsibility

  • Compatible with chlorine-free R410A refrigerant systems—which provide exceptional comfort without exacting a costly environmental toll
  • No ozone emissions— a known lung irritant

Reliable Performance

  • Quality you can trust— designed with reliable, time-tested components
  • Antimicrobial drain pan— resists the growth of mold and mildew
  • Meets Florida standard for less than 2% air leakage from units

Warranty and Specs

Warranty and Specs

  • 10-year limited warranty on covered components

CBX40UHV Product Literature

Product Brochures


CBX40UHV Air Handler Product Brochure

Installation Manuals


CBX40UHV Air Handler Installation Manual


Rated 4.7 out of 5 by 10 reviewers.
Rated 5 out of 5 by This thing works This unit is unbelievably quiet as is the EHB XP25 condenser unit. In South florida the humidity is an issue and with the unit set on "Humid" 79 and 50% the temp and humidity in the house never varies and the electric usage year over year is about 25% less. October 15, 2014
Rated 5 out of 5 by Awesome machine! This thing is beautiful! Very quiet, can't really tell when it's on. Combined with the comfort thermostat, it gets the temp where you set it and stays there. My old system would cool too long or heat too much, this thing is precise! July 30, 2014
Rated 5 out of 5 by There is only one choice. Having owned two previous Lennox systems I was aware of the quality and reliability of the product. July 8, 2014
Rated 5 out of 5 by Best Air Handler This is a very powerful air handler with a good filtration system. I like it a lot and it's build quality is very good. The electric heat elements also work very well and it allows me to feel warm in the cold winters where heat pumps can't perform as well. The iconfort capabilty is something that all houses should have, it makes everything so convenient. Also some say it whisper quiet but I think it is noisey. I don't know, it may be because of poor insulation in the furnace room, maybe the duct work is of poor qulaity (my house is really old) but I find it noisey. But the noise is something worth giving up for the quality and power. July 26, 2013
Rated 5 out of 5 by Whisper Quiet This air handler is whisper quiet; we cannot tell when it is running from the sound of it alone. We walk by one of the vents and go, "Oh, it's on!" February 24, 2013
Rated 4 out of 5 by Enjoying it so far Reviewing, but haven't really had time with the system. We have been enjoying it so far, quiet. December 22, 2012
Rated 3 out of 5 by Noisier than expected This unit is loud when the variable speed fan is slowing down. Loud enough that it will wake us up through the night. I expected a very quiet unit from what I was told, now I have to put insulation on my basement ceiling to quiet the noise. I was told by the company this noise is normal. December 13, 2012
Rated 5 out of 5 by Good combination of features for the value. I upgraded from an a single stage to a two stage heat pump and I am very glad I did. The CBX series variable speed air handler is quiet and efficient. The longer run time in stage one cooling allows for improved dehumidification while saving energy. December 5, 2012

*iComfort Wi-Fi® Touchscreen Thermostat must be installed with an iComfort-enabled indoor unit.

Recognitions and Certifications

UL Listed (C)(US) Good Housekeeping Healthy Climate Solutions

© 2014 Lennox International Inc.