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The quietest central air conditioners and heat pumps

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· 4 min read

Quietest central air conditioner beside a backyard patio

Sixteen outdoor condensers from eight brands publish AHRI 270 sound ratings, from 52 dBA at minimum speed to 77 at full load. See the quietest Carrier, Trane, Lennox and Rheem units, and why an "as low as" headline is often a different number.

On this page
  1. How we chose
  2. Our picks
  3. How to choose
  4. Comparison
  5. FAQs
  6. Bottom line
  7. Review history

A quick look at the quietest central air conditioners

A 2 ton Trane 20 TruComfort heat pump rates 52 dBA at minimum speed. A 5 ton Goodman GXV9S rates 77 at full load. Both figures come out of one test, AHRI Standard 270, and that shared test makes central air one of the few home categories where decibel ratings line up across brands.

The standard rates an outdoor condenser's A-weighted sound power, and the major makers publish those ratings size by size in their data sheets. Variable speed units get a minimum and a maximum. Sixteen current condensers from eight brands carry published ratings, with minimum speed figures running from 52 to 71 dBA and full load figures from 62 to 77.

Most makers lead with cooling, so the ranking here mostly follows cooling figures. Heat pump makers also print a heating row, and it does not always match: Trane's 2 ton 20 TruComfort rates "52/64" dBA in cooling and "51/71" in heating, minimum and maximum.

If your heat pump will run through a long winter, our quietest heat pumps guide is the heating-focused companion to this one, ranking ducted outdoor units by their AHRI 270 heating figures, size by size.

Where these figures come from

Each figure on this page is the maker's AHRI 270 rating, copied as Carrier, Trane, Lennox and the rest print it, together with the size and operating point it belongs to. Where a footnote says tested but not listed with AHRI, the figure counts as a maker declaration. No condenser was measured for this guide.

There are no prices because no maker publishes a US price; condensers are quoted by installing dealers.

QuietSpecs' picks of the quietest central air conditioners

Lowest full load rating

Carrier Infinity 23 Variable Speed Heat Pump (27VNA3)

  • Sound, minimum speed: "53" dBA, 2 ton, minimum cooling (AHRI 270 sound power)
  • Price: No maker list price
  • Best for: A heat pump beside a bedroom window or a patio
  • Skip it if: You need 5 tons, where every unit here gets much louder

The lowest full load rating in this survey belongs to Carrier's variable speed heat pump: "62" dBA at nominal cooling for the 2 ton size, and "53" at minimum cooling speed, tested in compliance with AHRI 270 but not listed with AHRI.

The 3 ton rates 56 and 64. Cooling and heating figures appear for every size, each with the speed in RPM behind it.

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Lowest minimum speed

Trane 20 TruComfort Variable Speed Heat Pump with WeatherGuard (5TWV0)

  • Sound, minimum speed: "52" dBA, 2 ton, cooling (AHRI 270 sound power)
  • Price: No maker list price
  • Best for: Homes where the unit spends most hours at low speed
  • Skip it if: Peak summer loads matter most, where Carrier rates lower

In cooling, the 2 ton 5TWV0X24 rates "52/64" dBA, minimum and maximum, "Rated in accordance with AHRI Standard 270-2008 (Min/Max)". That 52 is the lowest minimum speed figure of any unit in this survey, and the 3 ton rates 53/69.

Look in Trane's dealer handbook for it, since the consumer pages print no figures.

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Same 58 dBA floor at every size

Lennox SL25KCV Variable Capacity Air Conditioner

  • Sound, minimum speed: "58" dBA at every size (AHRI 270 sound power)
  • Price: No maker list price
  • Best for: Larger homes that need 4 or 5 tons
  • Skip it if: A heat pump is on your list, where Carrier and Trane lead

Every size from 2 to 5 tons rates "58" dBA at minimum speed, with maximums of 68, 70, 73 and 74, "Tested according to AHRI Standard 270 test conditions" as overall A-weighted sound power.

Lennox's "as quiet as 58 dB" claim is exactly that minimum, not a different quantity. Above 3 tons it is the best cooling-only choice.

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Clearest two stage labels

Carrier Performance 18 Two-Stage Air Conditioner (26TPA8)

  • Sound, low stage: "67 - Low Stage" dBA, 2 ton (AHRI 270 sound power)
  • Price: No maker list price
  • Best for: A mid priced quiet upgrade from a single stage unit
  • Skip it if: The unit sits near a bedroom, where variable speed pays off

No variable speed here, two stages with the clearest labels in the mainstream tier: "67 - Low Stage" and "69 - High Stage" dBA at 2 tons, tested in compliance with AHRI 270 but not listed with AHRI.

Carrier's "as low as 67 decibels" claim matches the rated low stage.

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How to choose

If one you own is already making a noise, start with Outside AC unit making loud noise.

AHRI 270 puts every brand on one scale

Carrier, Bryant, Trane, Lennox, Rheem, Goodman and Daikin all rate to AHRI 270, which makes their numbers more comparable than almost anything else on this site.

What they rate is sound power, the total noise the unit radiates, rather than the loudness at your window. Keep it apart from the sound pressure figures in our other guides. That includes the room units in our window air conditioner guide, whose makers print a figure per fan speed or a single "as low as" number, with no shared standard.

Some sheets carry a footnote saying the unit was tested in compliance with AHRI 270 but not listed with AHRI. The test is the standard one. The rating, though, is the maker's, not an entry in AHRI's directory.

Is a bigger central air conditioner louder?

Yes, and by more than most buyers expect. Within a single data sheet the same model often rates 10 to 14 dBA louder at 5 tons than at 2, as with Carrier's Infinity 21, which climbs from 68 to 72 at nominal cooling across its sizes, and Goodman's GXV9S, which goes from 67 to 77.

An oversized unit is a louder unit. The first step toward a quiet system is a proper load calculation, and the second is comparing models at the size you actually need.

If you are cooling a few rooms rather than a whole duct system, our mini-split guide compares ductless units whose makers publish indoor and outdoor dB(A) for every speed.

"As low as" headlines quote a different number

Two advertised figures in this category are not the AHRI 270 rating at all. Rheem promotes "Quiet Operation as low as 50dBA" for its RD18AY heat pump, and the spec sheet shows where the 50 comes from: the 3 ton sound pressure column. The sound power floor for the same size is 58. Goodman and Daikin advertise "as low as 45 dBA", which their sheets identify as sound pressure at 3 feet in the deepest quiet mode, where capacity drops by up to about half.

Other claims drift over time. A Bryant listing page still says 51 for a unit whose data sheet says 55, and Carrier's older Infinity 23 edition said 55 before a 2 ton size brought it to 53.

Trust the data sheet.

Twin brands print the same sound tables

Carrier and Bryant print identical sound tables for their variable speed air conditioners, as do Goodman and Daikin for the GXV9S and DC9VS. American Standard's maximums match the Trane 5TTV0 size for size, and its data sheet adds the minimum speed figures Trane leaves out; our American Standard AC page lists them.

When a quote for one twin comes in cheaper, the sound rating comes with it.

York, Luxaire and Coleman rate above the leaders

York's technical guides rate its current air conditioners from 70 to 77 dBA of AHRI 270 sound power, one figure per size. Even its lowest rating sits above the full speed figures of this guide's top picks. Our York page lists every size. Luxaire and Coleman share York's installation manual and repeat its listing claims word for word.

How the quietest central air conditioners compare

ProductTypeSizesStandardPrice
Carrier 27VNA3Variable speed heat pump2 to 5 tonAHRI 270, not listed with AHRINot verified yet
Trane 5TWV0Variable speed heat pump2 to 5 tonAHRI 270-2008, Min/MaxNot verified yet
Lennox SL25KCVVariable capacity air conditioner2 to 5 tonAHRI 270 test conditionsNot verified yet
Carrier 26TPA8Two stage air conditioner2 to 5 tonAHRI 270, not listed with AHRINot verified yet

Frequently asked questions

What is the quietest central air conditioner?

By AHRI 270 ratings in the makers' data sheets, Trane's 20 TruComfort heat pump has the lowest minimum speed figure, 52 dBA at 2 tons, and Carrier's Infinity 23 heat pump the lowest full load figure, 62 dBA at 2 tons. Among air conditioners only, Lennox's SL25KCV rates 58 at minimum speed at every size.

What does an AHRI 270 sound rating measure?

The outdoor unit's A-weighted sound power in dBA, meaning the total sound it radiates under the standard's conditions. Loudness at your window is a different thing, set by distance and surroundings. Since every major maker uses the same test, AHRI 270 ratings compare across brands in a way most appliance figures cannot.

Why does an "as low as" claim not match the rating?

Often because it is a different quantity. Rheem's "as low as 50dBA" for its RD18AY heat pump is the 3 ton sound pressure figure; the AHRI 270 sound power floor is 58. Goodman and Daikin's "as low as 45 dBA" is sound pressure at 3 feet in a quiet mode that reduces capacity by up to about half. Compare the sound power column, not the headline.

Is a variable speed unit quieter than a two stage one?

At low speed, clearly. Variable speed leaders rate 52 to 58 dBA at minimum speed, while Carrier's two stage Performance 18 rates 67 on low stage at 2 tons, and variable speed units spend most hours at low speed. At full load the gap narrows.

What does "not listed with AHRI" mean?

Carrier, Bryant and Rheem note that their units were tested in compliance with AHRI 270 but are not listed with AHRI. The test method is the standard one; the rating has not been entered into AHRI's certification directory. We record the note and treat the figures as maker declarations.

Can I buy a quiet central air unit on Amazon?

Barely. Dealers sell and install these units. Third party sellers list some Goodman single stage condensers and MRCOOL Universal heat pumps, but MRCOOL does not say whether its figures are sound power or pressure, so it stays out of the ranking. Expect to buy through an installer.

How do I make my existing outdoor unit quieter?

Keep it level and off the house wall, check the pad isolation, and keep plants and fences a few feet away rather than boxing it in. Carrier's data sheets list a compressor sound blanket accessory that it says can reduce a transient tone by up to 10 dB. A failing fan motor or loose panel is a service call, not a spec.

The bottom line

This is the rare category where brands compare cleanly. One test, AHRI Standard 270. One quantity, A-weighted sound power in dBA. Carrier, Bryant, Trane, Lennox, Rheem, Goodman and Daikin print it per size, and the variable speed units give a minimum and a maximum.

The headlines are where it goes wrong. Rheem advertises "as low as 50dBA" for a heat pump whose rated sound power floor is 58, because the 50 is a sound pressure figure. Goodman and Daikin advertise 45 dBA: sound pressure at 3 feet, in a quiet mode that gives up as much as half the cooling.

Size beats brand. The same model runs 10 to 14 dBA louder at 5 tons than at 2, so get the load calculation done before comparing anything.

Stanley Alu, founder and editor

What we also considered

These are worth knowing about, and why they didn't make the list.

  • Carrier Infinity 21 Variable Speed Air Conditioner (26VNA1)

    55 minimum and 68 nominal at 2 tons for Carrier's variable speed air conditioner; its "as low as 55" holds for the 2 and 3 ton sizes only.

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  • Bryant Evolution Extreme Variable Speed Air Conditioner (191VAN)

    Carrier's sister brand prints the same table as the 26VNA1, though a Bryant listing page still claims 51 where the data sheet says 55.

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  • Trane 20 TruComfort Variable Speed Air Conditioner with WeatherGuard (5TTV0)

    One figure per size and none for low speed: 64 at 2 tons up to 76 at 5.

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  • Trane 17 Multi-Speed Air Conditioner with WeatherGuard (5TTX7)

    Its submittal data gives 63 minimum and 71 maximum at 2 tons, while Trane's handbook lists a single 72 for the same size.

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  • American Standard AccuComfort Platinum 20 Variable Speed Air Conditioner (5A7V0)

    The brand's web pages show only a 64 to 76 range, but this Trane sister's product data sheet rates 52 minimum and 64 maximum at 2 tons, the same maximums as the Trane 5TTV0.

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  • Lennox EL22KCV Variable Capacity Air Conditioner

    The mid tier Lennox: 60 minimum, 68 maximum at 2 tons.

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  • Lennox SL22KLV Variable Capacity Cold Climate Heat Pump

    A variable speed Lennox heat pump at 58 minimum and 71 maximum, 2 tons.

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  • Lennox Merit ML17KC2 Two-Stage Air Conditioner

    Entry level, with one rating per size from 73 to 75 and no low stage figure.

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  • Rheem Endeavor Line Prestige Series Variable Speed Air Conditioner (RA19AY)

    Two unlabeled rows per size, 59 and 68 at 2 tons; the brochure's "as low as 57" rests on internal testing.

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  • Rheem Endeavor Line Prestige Series Side-Discharge Universal Heat Pump (RD18AY)

    Advertised "as low as 50dBA", which turns out to be the 3 ton sound pressure column. Its AHRI 270 sound power floor is 58.

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  • Goodman GXV9S Variable Speed Inverter Air Conditioner

    Normal mode rates 67 at 2 tons to 77 at 5; the "as low as 45 dBA" headline is quiet mode sound pressure at 3 feet with up to about half the capacity given up.

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  • Daikin FIT DC9VS Variable Speed Inverter Air Conditioner

    Built on the Goodman GXV9S platform, with identical sound tables.

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How we reviewed this article

Every statement here comes from the 6 maker documents, standards and agency pages listed under Sources, quoted where the wording matters. We did not measure, inspect or repair anything ourselves. Each substantive revision is dated below. How we work

  1. Current version

    The York section now quotes York's 70 to 77 dBA ratings, from technical guides that finally opened, and points readers to the new York page.

  2. American Standard's Platinum 20 data sheet prints per size minimum and maximum figures, 52 and 64 at 2 tons, so its note now gives them.

  3. First published, written by Stanley Alu.

Sources

Manufacturer pages and manuals for every product

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