Keystone 12,000 BTU Window Air Conditioner with 11,000 BTU Supplemental Heat White for 550 sq ft rooms
Keystone New 12,000 BTU 550 Sq Ft Window Air Conditioner with 11,000 BTU Supplemental Heat, White
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Keystone New 12,000 BTU 550 Sq Ft Window Air Conditioner with 11,000 BTU Supplemental Heat, White

104 ratings
Keystone New 12,000 BTU 550 Sq Ft Window Air Conditioner with 11,000 BTU Supplemental Heat, WhiteKeystone New 12 000 BTU 230V 550 Sq ft Window Wall Air Conditioner with 11 000 BTU Supplemental Heat KSTHW12BKeystone New 23 200 BTU 1500 Sq Ft Window Air Conditioner with 16 000 BTU Supplemental Heat WhiteKeystone New 8 000 BTU 350 sq ft Window Wall Air Conditioner with 3 500 BTU Supplemental Heat White KSTHW08B
BTU12000

Key item features

  • Powerful Climate Control: This unit offers 12,000/11,600 BTU cooling and 11,000 BTU supplemental heating, suitable for rooms up to 550 sq. ft., with dehumidification up to 2.5 pints per hour.
  • Specialized Power Requirement: Requires a 230-volt/20-amp electrical outlet with a 6.5-ft. LCDI power cord and NEMA 6-20P plug; it will not operate with a standard 115V outlet.
  • Versatile Operational Modes: Features 3 cooling speeds, 3 fan speeds, and 1 heat speed, along with an Energy Saver function, Sleep function, and a programmable 24-hour on/off timer.
  • Convenient User Interface: Equipped with electronic controls, an LED display, and a temperature sensing LCD remote control for easy operation and temperature management.
  • Adjustable Airflow & Maintenance: Provides adjustable 4-way air flow direction and includes an easy-clean, tilt-out mesh filter with a Check Filter alert.
  • Window Installation Kit: Comes with an adjustable, pleated window mounting kit, accommodating window heights of at least 16.5 inches and widths between 26.8" and 36".
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Specs

Air conditioner type, Window Dual Heater/ Air ConditionersBtu, 12000Coverage area, 550 sq ftCooling rate, 12000 BTUBrand, KeystoneMount type, Wall Mount

About this item

Product details

Keystone prioritizes your family's comfort, and our budget-friendly heat/cool 230V window air conditioner is designed to meet your needs. This versatile AC unit offers both efficient cooling and supplemental heat capability, serving as an additional heat source for outdoor temperatures above 23 degrees Fahrenheit. The heat mode is supplemental and cannot replace your primary heat source. Please note that this unit requires a special 230-volt/20-amp electrical outlet and will not operate with a standard 115V household electrical outlet. Enjoy ultimate cost savings with the energy saver mode, sleep mode, and programmable 24-hour timer. These features allow you to customize your heating and cooling preferences based on your schedule, lowering energy usage and costs. The Follow Me LCD remote control adds to the convenience of this unit, ensuring everyone can relax in comfort. Invest in our heat/cool 230V window air conditioner and enjoy year-round comfort for your family. With Keystone, your family's comfort starts here. KSTHW12B
  • Special 230-volt/20-amp electrical outlet required (Unit will not work with a standard 115V outlet)
  • 12,000/11,600 BTU cooling capacity / 11,000 BTU supplemental heating capacity
  • Supplemental heat capability provides an additional heat source to your main heat source when outdoor temperatures are above 23°F
  • Heating mode is supplemental and NOT meant as primary heat source
  • Designed for a room up to 550 sq. ft. with dehumidification up to 2.5 pints per hour
  • Indoor Noise Level dBA (Hi/Med/Lo):  61/58/55
  • Electronic controls with LED display allows you to easily select options with the touch of a button
  • Temperature sensing LCD remote control allows you control the temperature from across the room
  • Auto-restart saves your settings for when power is restored to the unit
  • Adjustable 4-way air flow direction allows you to easily control the direction of the cool air
  • 3 cooling speeds, 3 fan speeds, and 1 heat speed for multi-seasonal use
  • Programmable 24-hour on/off timer cools on your schedule
  • Energy Saver function conserves energy and saves you money
  • Sleep function gradually increases room temperature after being activated
  • Easy-clean, tilt-out mesh filter with Check Filter alert on the unit
  • 6.5-ft. LCDI power cord with NEMA 6-20P plug makes extension cords unnecessary
  • Adjustable, pleated window mounting kit included for window installation
  • Minimum window height: 16.5 inches
  • Window width dimensions: 26.8" minimum / 36" maximum
info:
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Specifications

Air conditioner type

Window Dual Heater/ Air Conditioners

Btu

12000

Coverage area

550 sq ft

Cooling rate

12000 BTU

Warranty

Warranty information

1 year limited

Please be aware that the warranty terms on items offered for sale by third party Marketplace sellers may differ from those displayed in this section (if any). To confirm warranty terms on an item offered for sale by a third party Marketplace seller, please use the 'Contact seller' feature on the third party Marketplace seller's information page and request the item's warranty terms prior to purchase.

Warnings

Customer ratings & reviews

4 out of 5 stars
stars
104 ratings70 reviews
Includes global ratings and reviews
How item rating is calculated
  1. 5 stars63% (66)
  2. 4 stars9% (9)
  3. 3 stars8% (8)
  4. 2 stars6% (6)
  5. 1 star14% (15)

Reviews summary

Pros

  • : Controls and setup are clear and the unit operates quickly.
  • : Allows for easy adjustments from a distance.
  • : Fits smaller windows, approximately 19x14 inches.
  • : Requires minimal effort and is easy to complete.
  • : Uses less power to cool effectively.
  • : Quickly cools and heats with efficiency.
Generated by AI
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Showing 1-3 of 70 reviews

Jun 23, 2026
Reviewer name: Paula
Item details
BTU: 8000
Sold and shipped byFour Seasons Trading Company
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Keystone 8000 BTU air conditioner with heat

Well, worth the money if you need an air conditioner I'm sure you're gonna need a heater as well. I'm using the air conditioner right now. I'm not so sure about the heater part. I'm still learning well worth the money Nice quality the compressor and the motor looks really nice on the backside of the air conditioner

Helpful?7DTWC7ATT6Y15023628571
May 1, 2026
Reviewer name: pamela
Top Reviewer
Item details
BTU: 23200
Sold and shipped byFour Seasons Trading Company
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Second Purchase

I bought this exact same unit a little over five years ago and paid about half of this. I was disappointed that the price had increased so much but it still worked well to heat and especially cool my guest house for the past five years. I live in Phoenix so the temperatures can sometimes exceed 115 degrees. I had the guest house rented for the past five years and the tenants said that it kept it cool. The times I went in there to clean I noticed how quickly it brought the temperature down. It's considered a portable or wall unit, so it's not meant to last forever but it did well for the past five years and I'm hoping to get at least that long from this new one.

Helpful?7DTWC7ATT6Y15023628571
Jun 30, 2025
Reviewer name: christianc42_7850
5 out of 5 stars
5 out of 5 stars review

This is heavy make sure you have a second person a

[This review was collected as part of a promotion.] Easy to install as it is already assembled. It does not make a difference in energy consumption so your power bill won’t change just a few cents however I used this in the summer and not in the winter so the heat could possibly cost more energy. Its not super loud just a little bit louder than a normal fan. This is a 220 v if you don’t have a 220 outlet do not buy this.

Review from influenster.com
Helpful?7DTWC7ATT6Y15023628571
Current price is $499.99
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Sold and shipped by Four Seasons Trading Company
4.201793721973094 out of 5 stars
4.2 stars out of 5, based on 223 seller reviews(4.2)
Extended holiday returns
Free Holiday returns until Jan 31