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Deal.ai › Keystone › Air Conditioners
Keystone
Keystone 18,800/18,400 BTU 230-Volt Window/Wall Air Conditioner with 16,000 BTU Supplemental Heat Capability

Keystone 18,800/18,400 BTU 230-Volt Window/Wall Air Conditioner with 16,000 BTU Supplemental Heat Capability

Best price now

$659.99at Best BuyChecked 59 min ago

Compared across 9 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.

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Price facts

  • Lowest price today: $659.99 at Best Buy (checked Nov 10, 2026).
  • Checked at 9 stores.

Our take on the Keystone 18,800/18,400 BTU 230-Volt Window/Wall Air Conditioner with 16,000 BTU Supplemental Heat Capability

This is a 230-volt window or wall unit that cools large rooms and adds supplemental electric heat. It delivers 18,800 BTU of cooling and 16,000 BTU of heat, so it can carry a big open living area or a finished basement through shoulder seasons. The remote, 24-hour timer, digital display and washable filter are standard conveniences at this size. Against 115-volt rivals it needs a dedicated 230-volt circuit, which is the main trade-off for its higher output.

Best forLarge living rooms and open-plan spacesFinished basements and additionsHeating in mild cold as a supplementWall-through installation
Pros
  • High cooling output for big rooms
  • Supplemental 16,000 BTU electric heat
  • Remote control and 24-hour timer
  • Washable filter is easy to clean
  • Can be installed through a wall
Cons
  • Requires a dedicated 230-volt circuit
  • Heavy and awkward to install alone
  • Electric resistance heat raises running costs
  • Bulky unit takes up window or wall space

Keystone 18,800/18,400 BTU 230-Volt Window/Wall Air Conditioner with 16,000 BTU Supplemental Heat Capability prices at every store

  • The Home DepotNew

    In stock

    $659.99Free shippingChecked 59 min ago
    Visit The Home Depot
  • Best BuyNew

    In stock

    $659.99Free shippingChecked 59 min ago
    Visit Best Buy
  • Lowe'sNew

    In stock

    $659.99Free shippingChecked 59 min ago
    Visit Lowe's
  • WalmartNew

    In stock

    $699.00Free shippingChecked 59 min ago
    Visit Walmart
  • Ace HardwareNew

    In stock

    $729.99Free shippingChecked 59 min ago
    Visit Ace Hardware
  • StaplesNew

    In stock

    $743.19Free shippingChecked 59 min ago
    Visit Staples
  • Aj MadisonNew

    In stock

    $699.99+ $99.00 shippingChecked 59 min ago
    Visit Aj Madison
  • QuillNew

    In stock

    $805.99Free shippingChecked 59 min ago
    Visit Quill
  • SylvaneNew

    In stock

    $849.99Free shippingChecked 59 min ago
    Visit Sylvane

Store links may earn us a commission. Some prices via Klarna.

Keystone 18,800/18,400 BTU 230-Volt Window/Wall Air Conditioner with 16,000 BTU Supplemental Heat Capability price history

Lowest price we've seen: $659.99 on Nov 10 at The Home Depot. Tracked across 9 stores since Nov 10.

What reviewers say

Owners of large Keystone window units generally report strong cooling and simple operation. Common complaints center on installation weight and the electrical work a 230-volt unit demands.

What people mention
  • Cooling powerPraisedOwners say it handles large rooms and open spaces that smaller units struggle with.
  • InstallationCriticisedBuyers describe the unit as heavy and awkward to seat in a window or wall sleeve.
  • Electrical needsCriticisedReviewers note it requires a dedicated 230-volt circuit, which often means an electrician.
  • NoiseMixedFans find low and medium speeds tolerable but high fan noticeably loud.
  • Heat modePraisedThe supplemental heat is seen as useful for cool evenings and extending use into fall.

Specifications

Color
White, MulticolorSource
Features
Timer, Remote Control, Display, Washable FilterSource
Functions
Cooling FunctionalitySource

Questions and answers

Does it need a special outlet?
Yes. It runs on 230 volts, so it needs a dedicated circuit, not a standard 115-volt wall outlet. Budget for an electrician if you do not already have one.
Can it be installed in a wall?
Yes. It is designed for window or through-wall installation, which suits rooms without a suitable window.
How much space will it cool?
At 18,800 BTU it is sized for large rooms, roughly open living areas and basements. Insulation, ceiling height and sun exposure change the real coverage.
Is the heat enough for winter?
The 16,000 BTU heat is supplemental electric resistance heat. It takes the chill off in mild weather but is not a replacement for a primary heating system in freezing climates.
What comes in the box?
The unit ships with a remote control and window installation kit. A wall sleeve and mounting hardware for through-wall use are usually sold separately.
Is the filter washable?
Yes. The filter is washable, and rinsing it regularly keeps airflow and cooling efficiency up.
Where is the Keystone 18,800/18,400 BTU 230-Volt Window/Wall Air Conditioner with 16,000 BTU Supplemental Heat Capability cheapest?
At Best Buy, for $659.99, as of our latest check.
Where can I buy the Keystone 18,800/18,400 BTU 230-Volt Window/Wall Air Conditioner with 16,000 BTU Supplemental Heat Capability?
9 stores we checked sell it, including The Home Depot, Best Buy, Lowe's, Walmart, Aj Madison.

Stores we've priced the Keystone 18,800/18,400 BTU 230-Volt Window/Wall Air Conditioner with 16,000 BTU Supplemental Heat Capability at

  • Ace Hardware deals and prices
  • AJ Madison deals and prices
  • Best Buy deals and prices
  • Home Depot deals and prices
  • Lowe's deals and prices
  • staples.com deals and prices
  • Walmart deals and prices

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