Customer Reviews for Keystone 230-Volt 12,000 BTU Window Air Conditioner with Remote, White (KSTHW12B)
Item # : 24641581
Model # : KSTHW12B
Keystone prioritizes your family's comfort, and our budget-friendly heat/cool 230V window air conditioner is designed to meet your needs.
- Window-mounted air conditioner cools with heating function covers up to 550 sq. ft. with dehumidification up to 2.5 pints per hour
- 12,000/11,600 BTU cooling capacity / 11,000 BTU supplemental heating capacity
Price is $524.99
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25 reviews
Most helpful positive review
Posted Mar 24, 2026
Love the heat feature!
This Keystone air conditioner with supplemental heat has been a great addition to our home. It cools the room relatively fast and keeps it comfortable. The supplemental heat feature is a huge bonus too, it’s perfect for those chilly mornings or evenings so you don’t have to turn on the main heat. Installing it was pretty straight forward and easy. It also comes with a h...
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Most helpful critical review
Posted Feb 25, 2026
80 lbs and left on sidewalk
This air conditioner is obscenely heavy. 80lbs, and FedEx left on the sidewalk, wouldn’t even help bring it up the steps. When I finally got it in the house, I couldn’t even set it up because the plug is not compatible with my outlets. It’s a 230v and the lines are like this -| instead of | |. I purposely picked the smaller btu which is compatible after reading that thi...
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LucyE
This reviewer received a free product or coupon in exchange for an unbiased review of the product
Reviewed at:
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Posted Mar 24, 2026
Love the heat feature!
This Keystone air conditioner with supplemental heat has been a great addition to our home. It cools the room relatively fast and keeps it comfortable. The supplemental heat feature is a huge bonus too, it’s perfect for those chilly mornings or evenings so you don’t have to turn on the main heat. Installing it was pretty straight forward and easy. It also comes with a h...
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AushlinF
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Posted Mar 14, 2026
Cools quickly
This thing is a BEAST! It cools down quickly and efficiently!!!! It is heavy though, but very easy to install. Easy to turn off and on, cools down a room very fast and stays cool. The room was very comfortable.
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AmyB
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Posted Mar 11, 2026
Perfect window air conditioner/heating unit for yo
Keystone 12,000/11,600 BTU 230V Window Air Conditioner with 11,000 BTU Supplemental Heating unit is so nice. We are liking it so much in our home. It so nice to be able to warm up my home in the Spring Mornings when its chilly out and then as the days warm up when can cool down the house with the air conditioner all in one unit. Perfect size for my first level home. The...
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PhoniseD
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Posted Mar 10, 2026
The perfect size easy to install and will cool any
This Keystone 8000 BTU Air Conditioner is the perfect size easy to install offer a lot of features that's easy to understand not too noisy it's energy efficient and will cool any room.
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DylanB
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Posted Mar 9, 2026
230v Cooling and Heating Machine!
This AC/Heater is an absolute game changer. It’s easy to operate, and relatively easy to install. I will admit that it was a bit heavy to lift. Once installed, this AC’s ventilation is insane. Super strong airflow. And the fact that this can also heat makes its value that much greater. Thank you guys so much for this wonderful opportunity!
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CarrieL
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Posted Mar 9, 2026
No more hot summer nights
Can’t wait for warm weather to come around and I can keep cool with my new window Air Conditioning unit. No longer going to have sweat out the hot summer nights with new unit. Plenty of BTU’s to keep my place cool!
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NimaP
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Posted Mar 7, 2026
Good unit with both heat and AC
It is a solid unit. Not too heavy. Easy enough to install in window. The best is that it is an AC but in winter can give heating capability. Too cold to turn on AC right now but excited to try the AC part of it
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JenniferM
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Posted Mar 7, 2026
Keystone Window Air Conditioner
This Keystone Window Air Conditioner with 11,000 BTU with Supplemental Heat capabilities is an amazing quality product. It comes with easy to read instructions and it's easy to install. I love the way it's designed. It's definitely made to last and is very durable. It comes with a remote control for easy access. It runs like a dream and you don't hear a sound either. It...
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VickieS
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Posted Mar 6, 2026
Really nice ac but be prepared to upgrade wiring
The 12,000 btu keystone ac with heat is really nice I just didn’t realize I would have to have a wire run from my breaker box cause plug is larger then your traditional 110 outlet but will be worth it once it’s done
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RebeccaB
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Posted Mar 4, 2026
Good buy!
I think this has really good features, installation wasn’t hard at all and it’s built well. I would recommend this to anyone that needs an additional unit.
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KeyV
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Posted Mar 1, 2026
Great so far
We are using this in a small bedroom in my mother in laws home and this week in Texas it has been summer temps. She likes it and it cools the room very easily it was easy to install and she is happy having a cool room again. Would recommend this brand of ac depending on room size this is in a small bedroom.
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CassieW
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Posted Feb 26, 2026
Fantastic air conditioner!
We are so happy with this air conditioner! It fits into the window perfectly and was easy to install. It is a solid air conditioner too so it seems it’s high quality. The functions/buttons are super easy to use and it works SO quickly. No maintenance needed and after it’s used, we’re not seeing any irregular draining or issues. Super excited to have this for the summer ...
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YanelysG
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Posted Feb 26, 2026
Great
Really nice Keystone Air Conditioning Window Unit. Works wonderfully and it’s awesome that it has heating as well. It is really Easy to install!
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JessicaW
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Posted Feb 26, 2026
Really good air conditioner/ heat
Really nice air conditioner gets the room cold quick and has heat as well. Really easy to clean and easy to install into a window. Really good brand!
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AshleyP
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Posted Feb 25, 2026
80 lbs and left on sidewalk
This air conditioner is obscenely heavy. 80lbs, and FedEx left on the sidewalk, wouldn’t even help bring it up the steps. When I finally got it in the house, I couldn’t even set it up because the plug is not compatible with my outlets. It’s a 230v and the lines are like this -| instead of | |. I purposely picked the smaller btu which is compatible after reading that thi...
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MichelleG
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Posted Feb 25, 2026
Works really good!
This unit it great for smaller to medium size rooms. It easily cools the room without taking long to cool it. I tried the heat option as well to test it and it works really well too but feel like it takes a little longer to heat up the room. It was easy to set up and easy to figure out how to use it.
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nancyland_2554
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Posted Aug 8, 2025
Need an outlet adapter
Luckily, the size of the window AC actually fits. It’s compacted and easy to install. However, my issue is the plug in is not compatible to the standard US outlet. We are not able to actually use it yet until we get an adapter.
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ocsiren_1397
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Posted Jul 10, 2025
Great Product
This Keystone air conditioner works great. My husband uses it in his office. It was easy to set up. It's good quality and not noisy. It comes with a remote which is nice. There's also heater mode which works well but haven't used it since it's summer but will come in handy during cooler weather.
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christianc42_7850
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Posted Jun 30, 2025
This is heavy make sure you have a second person a
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.
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chaup10_7409
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Posted Jun 12, 2025
Performance
Best window A/C I ve ever used and since we live in texas in the winter the Heat pump option works great. The limit of ourside temps needing to be above 41 is no problem at all. In the last the lowest recorded temp in texas where we live has only been lower than 41 for 1 day in the last seven years.
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