What is the quietest Goodman air conditioner?
The GXV6S is the quietest Goodman air conditioner on its maker's figures, rated 61 dBA sound power at 1.5 tons and 73 at 5 tons. Of the two lines with a stated test basis, it rates lower at every size.
From 2 tons up it lists 64, then 68 at 3 tons, 72 at 4 and 73 at 5. That puts it three or four dBA under the GXV9S at 2, 3 and 5 tons and one under at 4. Its footnote reads "Compliant with AHRI 270.", the industry standard for rating an outdoor unit's sound power.
The single stage GLXS4M and GLXS4B list 67 at 3 tons, which looks lower than the GXV6S's 68. Those rows name no standard and no quantity, so this page does not rank them against the inverter.
Goodman's decibel figures come from the dealer spec sheet linked on each model's goodmanmfg.com page. The product pages themselves carry no sound row, only the quiet mode claim on the two inverter models.
The GXV6S and GXV9S sheets have a full Sound Data section: a Total Unit Sound Rating in dBA with octave bands from 125 to 8,000 Hz, a quiet mode table, and estimated sound pressure at set distances. The GXV9S note says "Tested in accordance with AHRI Standard 270." Neither sheet names the edition.
The other five sheets give one line under cooling capacity. The GLXS3B, GLXS4B, GLXS4M and GLXS5B call it "Decibels (dBA)"; the GLXT7C calls it "Decibels (High/Low)" and prints one value. None of the five says if its number is power or pressure, gives a distance, or cites a standard.
A model number search of the AHRI certification directory did not fill the gap. Its air conditioner results list capacity, EER2 and SEER2 for each matched system, with no sound column at all.
How loud are Goodman's inverter air conditioners?
Goodman's two inverter air conditioners rate 61 to 77 dBA sound power in normal mode, one figure per size. The GXV6S spans 1.5 to 5 tons; the GXV9S comes in 2, 3, 4 and 5.
| Size | GXV6S, dBA sound power | GXV9S, dBA sound power |
|---|
| 1.5 ton | 61 | not offered |
| 2 ton | 64 | 67 |
| 2.5 ton | 67 | not offered |
| 3 ton | 68 | 71 |
| 3.5 ton | 71 | not offered |
| 4 ton | 72 | 73 |
| 5 ton | 73 | 77 |
Goodman does not name the operating point behind these normal mode ratings, and gives no minimum speed figure apart from quiet mode. Read each number as the sound rating for that size, not as the range an inverter covers through a day.
The 5 ton GXV9S stands out in the octave table. Its 125 Hz band reads 79.6 dB, above its 77 dBA overall rating, because A-weighting discounts low pitched sound. The 5 ton GXV6S lists 62.9 dB in the same band.
Why does the GXV6S rate quieter than the GXV9S?
The GXV6S rates quieter than the GXV9S at all four shared sizes, and Goodman offers no explanation. Its own octave tables show a pattern: three GXV6S sizes repeat, figure for figure, a GXV9S size one step smaller.
The GXV6S rows at 2.5, 3.5 and 5 tons match the GXV9S rows at 2, 3 and 4 tons in every octave band. In practice, a 5 ton GXV6S carries the sound table of a 4 ton GXV9S.
The trade is efficiency. The GXV6S is rated "Up to 17.2 SEER2" against "Up to 19 SEER2", and its maximum cooling rows run slightly lower at matching sizes: 34,200 BTU/h against 35,000 at 3 tons, and 53,500 against 57,000 at 5. Both use side discharge cabinets with what Goodman calls a "grille-style sound control side design".
How many decibels is the Goodman GLXT7C?
The GLXT7C, Goodman's two stage air conditioner, lists 69 at 2 tons, 70 at 3, 73 at 4 and 75 at 5. The row is headed "Decibels (High/Low)" yet holds one figure per size, leaving its stage unclear.
The sheet names no standard or quantity for the row. It does list the parts Goodman credits with quiet running: a "Quiet two-speed ECM outdoor fan motor" and a "High-density foam compressor sound blanket", around a "Two-Stage Copeland Ultra-Tech scroll compressor".
A two stage compressor is designed to idle along on its smaller stage through mild weather. Goodman publishes nothing separate for that stage, so the four figures cannot be pinned to either end of the label.
One more two stage Goodman hides in the single stage line. The 5 ton GLXS5BA6010A* lists Stage "Two" and an ECM fan motor, rated 76 on its "Decibels (dBA)" row, and it is left out of the single stage comparison below.
Which single stage Goodman is quietest at each size?
The quietest single stage Goodman changes with size: the GLXS4M leads or ties from 2 to 3 tons, the GLXS4B at 3.5 tons, and the North-only GLXS3B at 4 and 5 tons, on Goodman's unexplained "Decibels (dBA)" row.
| Size | GLXS4M | GLXS4B | GLXS3B, North | GLXS5B |
|---|
| 1.5 ton | 73 | 74 | 73 | 73 |
| 2 ton | 69 | 74 | 74 | 69 |
| 2.5 ton | 70 | 71 | 74 | 73 |
| 3 ton | 67 | 67 | 69 | 71 |
| 3.5 ton | not offered | 72 | 73 | 74 |
| 4 ton | not offered | 73 | 71 | 75 |
| 5 ton | not offered | 76 | 74 | 76, two stage |
These four lines share one sheet layout and one row label, which is why they are ranked against one another and against nothing else. Whatever basis Goodman used, nothing on the sheets suggests it differs between them.
Efficiency and quiet do not move together here. The GLXS5B, rated up to 16.5 SEER2, is the most efficient of the four, yet it prints the highest figures at 3.5 and 4 tons. The GLXS3B, the value line at up to 15 SEER2, holds the lowest 4 and 5 ton numbers but is coded for the North only.
The GLXS4M is a multi-family model built from 1.5 to 3 tons. In that span it never lists above 73, and at 2 and 2.5 tons it beats the GLXS4B by five and one dBA.
Why do some 3 ton Goodman units list lower than their 2 ton siblings?
Goodman's sheets never explain why the 3 ton GLXS4B, at 67, lists seven fewer than its 2 ton sibling. They do show the compressor type changing there, from "Rotary" up to 2.5 tons to "Scroll" above.
The GLXS3B makes the same switch and shows the same dip: 69 at 3 tons against 74 at 2 and 2.5. The GLXS4M and GLXS5B use scroll compressors at every size, and neither drops that steeply between 2 and 3 tons.
A pattern on a spec sheet is not proof of cause, and the condenser fan changes between sizes too. The useful point for a buyer is narrower: on a single stage Goodman, a larger unit is not automatically a louder one, so check the figure for the size your load calculation calls for.
What does Goodman's quiet mode do?
Goodman's quiet mode, offered on the GXV6S and GXV9S, holds the inverter to one of three sound suppression levels, LV.1 to LV.3. The spec sheets print the sound power, sound pressure and approximate capacity lost at each level.
At LV.3, the GXV6S rates 57 to 59 dBA sound power in every size, with capacity down about 40 to 50 percent. The GXV9S rates 57 to 59 at 2 to 4 tons but 66 at 5 tons, where it gives up about half its capacity. LV.1 costs about 5 percent on both lines.
One row does not fit. The 1.5 ton GXV6S lists 63 dBA at LV.1, two above its normal mode rating of 61, and at 2 tons the two are level at 64. Goodman does not explain either.
The headline claim, "as low as 45 dBA", is sound pressure rather than sound power. Goodman's footnote says quiet mode levels were "determined at a distance of 3 [ft]", and 45 is the LV.3 pressure for each GXV9S size and for the GXV6S from 2.5 tons up. The 1.5 and 2 ton GXV6S go lower, to 40 and 41.
How loud is a Goodman air conditioner at the property line?
Goodman's inverter sheets estimate sound pressure at 3, 5, 7, 9 and 15 feet, with zero, one or two reflective surfaces nearby. The other five sheets offer no distance figures.
Those estimates are footnoted "Compliant with AHRI 275 utilizing standard mode, total sound levels". With no wall behind it, a 2 ton GXV6S reads 57 dBA at 3 feet and 43 at 15; a 2 ton GXV9S reads 60 and 46. At 5 tons the figures are 66 and 52 for the GXV6S, 70 and 56 for the GXV9S. Each reflective surface adds 3 dBA at every distance in both tables.
Local noise rules are often written at the property line, which makes this the table to bring to a permit office or a neighbor. A condenser tucked into a corner counts two reflective surfaces, which puts a 5 ton GXV9S at 62 dBA even 15 feet out.
Are Goodman air conditioners noisy?
No, on the figures Goodman rates to AHRI 270: the GXV6S's 61 to 73 dBA and the GXV9S's 67 to 77 fall within the band other big brands print for their own variable speed condensers.
Trane's 2026 handbook gives its variable speed 20 TruComfort 64 to 76 dBA under AHRI 270-2008, as covered on the Trane air conditioner decibels page. Goodman names no edition, so one or two dBA separating the brands means little.
The single stage rows are harder to place. GLXS lines list 67 to 76, close to the 71 to 80 Lennox gives its single stage condensers on the Lennox page. Without a stated basis for Goodman's rows, that resemblance proves nothing either way.
