A decibel (dB) is a unit used to measure the relative intensity of sound. For example, sound levels in a library are normally about 40 dB, normal conversations range from about 50 to 60 dB, and an operating motorcycle or garbage truck can be as high as 100 dB.

Older furnaces, air conditioners and heat pumps often have relatively high operating sounds, along with the noisy stops and starts associated with single-stage operation. Lennox offers a full line of home heating, cooling and ventilation products that are designed to be as quiet as they are efficient.

The Lennox® SL28XCV air conditioner is engineered with a variable-capacity compressor and a special sound-dampening system which ensures it operates at a noise level that is, quite simply, unheard of. The SLP99V gas furnace from Lennox is the quietest and most efficient furnace you can buy,* engineered to run at variable speed to drastically minimize the sound of air kicking on or off inside the home.

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*Based on sound pressure levels during steady-state, high-fire and low-fire operation of Lennox® SLP99UH070XV36B as of March 2020 at mid-point temperature rise and minimum external static pressure when set up per Section 4.4.4 of AHRI 260-2012. Based on AFUE efficiency rating of Lennox SLP99UH090XV60C and leading competitive units listed in AHRI directory as of December 2019. Efficiency ratings established per test standard ANSI/ASHRAE 103-1993.

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