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Keystone 18,800 BTU Window Air Conditioner with 16,000 BTU Supplemental Heating, 230V, Window AC Unit for Living Room, Apartment, Large Rooms up to 1000 Sq.Ft. | 16,000 BTU Supplemental Heating, 230V for Living Room, Apartment, Large Rooms up to 1000 Sq.Ft.

  • Based on 62 reviews
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Availability: In Stock.
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Arrives Wednesday, Aug 12
Order within 14 hours and 29 minutes
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Size: 18,000 BTU


Features

  • Reliable Window AC Units: Our powerful 18,800 BTU cooling capacity / 16,000 BTU supplemental heating capacity window air conditioners can efficiently provide comfort all year long for any large space up to 1,000 Sq.Ft.
  • All in One Window Unit Air Conditioners: Enjoy cooling, supplemental heating, dehumidification, and fan circulation; Supplemental Heating mode is meant to be operated when temperatures outside are between 23 and 76 degrees; Mode is supplemental and NOT meant as primary heat source
  • Smart Remote: The I Sense remote takes the temperature of the room you are in, displays it on the remote's LCD screen and sends a signal to your window air conditioner with remote control every 3 minutes for accurate cooling
  • Powerful Cooling on a Budget: Our High Efficiency air conditioner window unit will give your electric bill a break by using the 'Energy Saver' or 'Sleep' mode
  • Space Saving Design: Save your floor space with this air conditioner for windows; Window installation kit included

Description

At Keystone, we prioritize your family's comfort. Our heat/cool 230V window air conditioner is designed with versatile supplemental heat when outdoor temperatures exceed 23 degrees Fahrenheit. Please note that this mode is meant to complement your primary heat source and should not be relied upon as the sole heat source. It is important to have a special 230-volt/25-amp electrical outlet for optimal operation, as this unit does not function with standard 115V household outlets. Our window air conditioner is equipped with money- saving features such as an energy saver mode, sleep mode, and a programmable 24-hour timer. With the convenience of our Follow Me LCD remote control, everyone can easily adjust settings and enjoy the blissful comfort provided by our unit. Choose Keystone for the ultimate in comfort and efficiency for your family.

Brand: Keystone


Capacity: 3.8 pints


Cooling Power: 18800 british thermal units


Special Feature: 4 Way Swing, Dehumidifier, Filter Light Reminder, Heating & Cooling Function, Remote Controlled


Product Dimensions: 25.39"D x 23.62"W x 17.91"H


Start year: 2023


Seasonal Energy Efficiency Ratio (SEER): 10.7


Color: Bright White


Voltage: 230 volts


Noise Level: 55 db


Cooling Power: 18800 british thermal units


Additional Features: 4 Way Swing, Dehumidifier, Filter Light Reminder, Heating & Cooling Function, Remote Controlled


Color: Bright White


Noise: 55 db


Refrigerant: R-32


Filter Type: Washable


Inverter Type: No Inverter


Installation Type: Window


Compressor Type: Scroll


Air Conditioner Application: Residential


Core Material: Aluminium Alloy


Voltage: 230 volts


Power Source: Corded Electric


Wattage: 4800 watts


Seasonal Energy Efficiency Ratio (SEER): 10.7


Annual Energy Consumption: 4800 watts


Air Flow Efficiency: 760 cubic_feet_per_minute_per_watt


Control Method: Remote, Touch


Controller Type: Remote Control


Operating Mode: Cooling


Warranty Type: 1-year parts and labor, plus additional 4 years for sealed system


BEE Star Rating: no


Heating Capacity: 16,000 BTU


Number of Heating Elements: 1


Brand Name: Keystone


Start Year: 2023


Model Name: Keystone Air Conditioner


Model Number: KSTHW18B


Unit Count: 1 Count


Included Components: ac, remote, batteries, mesh air filter, window installation kit


UPC: 840148726772


Manufacturer: Keystone


Item Type Name: Keystone 18,800 BTU Window Air Conditioner with 16,000 BTU Heating


Warranty Description: 1-year parts and labor, plus additional 4 years for sealed system


Item Dimensions D x W x H: 25.39"D x 23.62"W x 17.91"H


Item Weight: 117.3 pounds


Window Opening Maximum Width: 40.5 inches


Window Opening Minimum Height: 18.5 inches


Window Opening Minimum Width: 28 inches


Window Opening Maximum Height: 18 inches


Capacity: 3.8 pints


Floor Area: 1000 square_feet


Room Type: Bedroom, Living Room


Form Factor: Window


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Aug 12

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • 18,000 BTU heat and air conditioner,built in wall unit.
Size: 18,000 BTU
This is a very good air conditioner and easy to install, a very fair price and this unit also has built in heating, I would recommend this unit to anyone looking for a good quality heating and cooling system, it is so much quieter than the unit that I was using and it has a remote control which is very helpful due to where I had to install this unit. ... show more
Reviewed in the United States on June 29, 2025 by Robbin S.

  • It heated alright - right until it melted!
Size: 18,000 BTU
Awful. Tried two of them. We had to use an oven socket to make it work - so had to rewire everything. The first blew smoke out time we got it plugged in and wouldn’t cut off except the main switch. The second worked great for about a month, then caught on fire one morning. Made some popping noises, sparks, and burning. The plug and socket burned and melted. Had an electrician look at it and said the plug design was the problem from the get go. ... show more
Reviewed in the United States on February 9, 2025 by April S Lee

  • Uses 6-30 NEMA plug!
Size: 18,000 BTU
This product is excellent, it works very well! I bought this to replace my old Keystone air conditioner which was 17,700 BTU. It was really easy to install because it uses the same cage-type frame, so all I had to do was pull out the old one and slide this one in. One thing that I would note is that because this product offers heating, this uses a 6-30 NEMA plug instead of the 6-15 NEMA plug that these types of air conditioners normally use. I had to replace my outlet to accommodate this, but if you don't have an available 30amp breaker, this could end up being a big problem. Definitely something to consider, but the product works well and I definitely recommend it! ... show more
Reviewed in the United States on June 8, 2025 by Miranda

  • Great replacement unit.
Size: 18,000 BTU
Replaced a 40 year old 24,000 btu unit with this and it works fine. The heat is a big plus to supplement our electric baseboard heat. Remote is a little quirky.
Reviewed in the United States on November 7, 2025 by Jim M.

  • Works great
Size: 18,000 BTU
This kept my house warm and the electric bill average this past winter. I’m looking forward to seeing how well it cools this summer. Overall, I am very pleased with it.
Reviewed in the United States on March 16, 2025 by Gidget Leonard

  • Window air conditioner
Size: 18,000 BTU
The function is great so far overall satisfied with product. Purchase for rental which has been over year and have one for myself has been functioning for about 3 years now with no issues yet. The efficiency shut off time is great. noise level is normal no loud noise.
Reviewed in the United States on February 6, 2025 by Leslie Grindstaff

  • Do not buy waste of money
Size: 18,000 BTU
Not only did I have to spend time and money to get new receptacle put in because the plug is not US plug compatible. But it only has one job, one room to cool off and I can’t even do that. I’m disabled and unable to just get up and go shopping and buy a fan or whatever so I spent all this money on this stupid air conditioner just to sit here and die in the Louisiana heat. I’m not impressed. The quality of this product is crap. There is no value for the money because it doesn’t work right. You can’t adjust the vent to blow the air down and I seriously feel like I’m about to die in here it’s so freaking hot. ... show more
Reviewed in the United States on August 17, 2025 by Kitten Mayard

  • Hot or Cold!
Size: 18,000 BTU
Works great! Heating the room or cooling it
Reviewed in the United States on January 20, 2025 by D. Pifer

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