Brand against brand

Keystone vs Whirlpool window air conditioners

Both lineups side by side at every size both brands sell, from the 17 new window air conditioners we can find in stock right now: live prices, CEER ratings, noise and the warranty each listing states.

The short answer

We track 12 Keystone and 5 Whirlpool window air conditioners in stock, and both brands sell 3 sizes in common (10,000, 12,000 and 18,000 BTU).

  • Keystone's cheapest model costs less at 2 of the 3 sizes; the two are within 5% or $20 at 1.
  • Whirlpool has the quieter model, by 3 dB(A) or more, at both sizes where both have a verified noise rating.

The better buy depends on your size, so compare the models at yours below.

Prices last refreshed Oct 27, 2026Independent, nobody pays for placement.

Keystone and Whirlpool at a glance

Keystone and Whirlpool window air conditioners: the in-stock lineups compared
KeystoneWhirlpool
In stock of models we track12 of 175 of 8
Sizes in stock8,000 to 24,000 BTU6,000 to 18,000 BTU
Live prices$279.99 to $919.99$269.99 to $779.99
Best CEERCEER 15 (several models)Not published
ENERGY STAR4 of 120 of 5
Inverter models4 of 122 of 5
Wi-Fi, as listed0 of 120 of 5
Heat too5 of 120 of 5
Compressor warranty, as listed1 to 4 yr (11 of 12 state it)1 yr (5 of 5 state it)
Recall checkNone namedNone named

Size by size

Every new window air conditioner of each brand we can find in stock, cheapest first, at each size both sell. A model within 5% of a size is grouped with it and shows its own rating. marks a noise rating we have checked against the retailer's specification for that exact model.

10,000 BTU

The two cheapest, head to head
  • Keystone's cheapest is $30 less
  • Quietest verified: Whirlpool 42 against 52 dB(A)

Keystone · 2 in stock

Whirlpool · 2 in stock

12,000 BTU

The two cheapest, head to head
  • Cheapest prices within 5% or $20 of each other

Keystone · 2 in stock

Whirlpool · 1 in stock

18,000 BTU

The two cheapest, head to head
  • Keystone's cheapest is $100 less
  • Quietest verified: Whirlpool 49 against 54 dB(A)

Keystone · 3 in stock

Whirlpool · 1 in stock

Only Keystone sells 8,000, 14,000 and 24,000 BTU in stock; only Whirlpool sells 6,000 BTU.

Prices are live retailer offers and change often. compare.ac may earn a commission on purchases, at no cost to you; it never changes the price you pay or how we compare.

How we compare two brands

  • Only new units we can find in stock with a live price, at the same size. A brand's average says more about its size mix than about the brand.
  • A price difference counts when it is at least 5% and at least $20, and only between models that install the same way (a do-it-yourself kit is never priced against an installer-fitted system).
  • Efficiency is compared on one scale (CEER) and counts at a gap of 0.5 or more; noise counts at 3 dB(A) or more, using only ratings checked against the retailer's specification for the exact model.
  • Warranty terms are as each listing states them. Models named in a CPSC recall are never compared or sold here.
Read our full methodology

Keystone vs Whirlpool: common questions

Is Keystone or Whirlpool cheaper?
It depends on the size. Comparing each brand's cheapest new, in-stock model at the same size, Keystone's cheapest model costs less at 10,000 BTU ($329.99 against $359.99) and 18,000 BTU ($679.99 against $779.99) and the two are within 5% or $20 at 1 size. These are live retailer prices and change often.
Which is quieter, Keystone or Whirlpool?
Comparing the lowest indoor noise rating at each size both sell, counting only ratings we have checked against the retailer's specification for the exact model (its minimum noise level), Whirlpool has the quieter model at 10,000 BTU (42 against 52 dB(A)) and 18,000 BTU (49 against 54 dB(A)). A gap under 3 dB(A) is too small to hear reliably, so we call it a tie.
What sizes do Keystone and Whirlpool window air conditioners come in?
In stock right now, Keystone sells 8,000, 10,000, 12,000, 14,000, 18,000 and 24,000 BTU and Whirlpool sells 6,000, 10,000, 12,000 and 18,000 BTU. So only Keystone sells 8,000, 14,000 and 24,000 BTU and only Whirlpool sells 6,000 BTU. Size the unit to the room first: an oversized unit short-cycles and leaves the air cool but damp.
Do Keystone and Whirlpool make inverter window air conditioners?
Keystone has 4 inverter models in stock, and Whirlpool has 2, going by each listing and the maker's model numbers. An inverter compressor slows down instead of switching on and off, which is usually quieter and more efficient at part load.
Which has the longer warranty, Keystone or Whirlpool?
As the retailer listings state it, in-stock Keystone models cover the compressor for 1 to 4 years depending on the model (11 of 12 listings state a term) and Whirlpool models for 1 year (5 of 5). Where a listing names no separate compressor term, its general or parts term is what covers the compressor. Some terms require registering the unit, and a maker can require professional installation to honor its warranty, so read the warranty document before you buy.
Have any Keystone or Whirlpool window air conditioners been recalled?
None of the 17 Keystone and 8 Whirlpool window air conditioners we track is named in a CPSC recall notice we check. That covers the models listed here, not every model either brand has sold, and it is not a safety certification.

Go deeper

Is Keystone a good brand? Every Keystone air conditionerIs Whirlpool a good brand? Every Whirlpool air conditionerBest window ACWindow vs portableWhat size do you need? Sizing calculator

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