Lennox G40UH Furnace | Reviews | FurnaceCompare®

Lennox G40UH Furnace Overview

Filters for the Lennox G40UH

Air Flow ConfigurationCabinet WidthFilter Size(s)
All14.5″14x25x1 (bottom)
16x25x1 (side)
All17.5″16x25x1 (side)
16x25x1 (bottom)
All21″16x25x1 (side)
20x25x1 (bottom)
All24.5″16x25x1 (side)
All24.5″24x25x1 (bottom)

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Consumer Reviews of Lennox G40UH


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #12 of 29 Lennox Furnace
  • 28.57% of customers recommended

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Lennox G40UH Furnace Reviews

Showing 6-7 of 7 reviews

"Lennox furnace"

1.0 rating
Very Unsatisfied

I have a 3 year g40uh (X)series Lennox gas furnace that does not blow heat. The technician charged $124 to fix the combustion air inducer. He said that the motor for this model has been painted on the inside and the paint become flaky with heat and ultimately will clog the motor. The replacement motor has also been painted and his recommendation is to buy a new American Standard Ace model gas 80% furnace. Does anyone know if this interior paint problem of the motors is real?

"Lennox Gas Furnace"

1.0 rating
Very Unsatisfied

The builder installed a Lennox g40uh(x) series gas furnace In the last 3 years when it is time to turn on the furnace, the tube passageway to the air flow was clogged not allowing the burners to light up. Does anyone know why this is happening and can tell me what to do to prevent this from happening

Other G40UH Reviews

Lennox G40UH Model Numbers

The G40UH is available in different models which vary in efficiency and capacity.

Model Number AFUE BTUs per Hour
G40UH-36A-070* 80 66,000
G40UH-36B-090* 80 88,000
G40UH-48B-090* 80 88,000
G40UH-48C-110* 80 110,000
G40UH-60C-110* 80 110,000

G40UH Warranty

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